Do Canadians need a visa to travel to a conference in Argentina? Do Germans need a visa to travel to a conference in Argentina?

I am posting the below information in case it is useful to somebody, but obviously without any guarantee.

Information available online

• The Government of Canada website on Entry/Exit Requirements for Canadians to Argentina states: "Tourist Visa: Not required; Business Visa: Required", but it does not define "business". Moreover, the information appears to be wrong (see below).
• The website of the Argentinian Consulate in Montreal states that "Canadian citizens do not need a visa when going as tourists to Argentina", and then defines a number of business visas. The implication is that Canadians need a visa to enter Argentina on business (however, this appears to be wrong, see below).
• The website of the Argentinian Ministry for the Interior and Transport defines "Tourists" as "for rest or recreation", and defines a number of visa for business purposes.
• The website of the Argentinian Embassy in London lists Canada and Germany among the countries whose citizens do not need a visa for tourism, but does not list them among the countries whose citizens do not need a visa for business purposes. The implication is that Germans and Canadians require a visa to travel to Argentina on business. (This also appears to be false, see below).
• The website of the Argentinian Consulate in Sydney, Australia lists Germany and Canada among the countries for whom no visa is required as "tourists", but does not list them among the countries for whom no visa is required as "businessman, investment or market research (e.g. visiting customers, negotiations, commercial exhibitions) for ordinary passport holders". The implication is that Germans and Canadians require a visa to travel to Argentina on business. (However, this appears to be wrong, see below).
• The website of the Argentinian Consulate in Toronto has some detailed information about conference visits. It states that "The participants in Conferences, Congresses and Seminars in Argentina may enter as tourists. No need to apply for a visa in such cases the Canadians, nor the other nationals who do not require visas to visit Argentina in the category of tourist" (emphasis in the original). However, it then also states that "Speakers and organizers of Conferences, Congresses and Seminars in Argentina, should enter our country with visa in character as "professional"". The latter information appears to be incorrect, see below.
• The website of the Internaltional Association for Dental Research lists Canada and Germany among the countries whose citizens "require a visa if they intend to travel for business purposes". (This appears to be wrong, see below).

What I actually found in Argentina

One may wonder why this information is not publicly available ahead of time, and why it actually contradicts what is stated on the websites of various Argentinian consulates. Perhaps they hope to raise revenue by selling business visas to people who don't need them? Or perhaps it is a new policy that the consulates do not yet know about.

I also tested whether I need such a visa as a German citizen. Note that the citizens of the United States, Canada, and Australia must pay a so-called "reciprocal fee", which varies from $75 (for Canadians) to $160 (U.S.). So I decided to enter as a German instead. I found:

• As expected, I did not have to pay a reciprocal fee;
• Nobody asked me any questions about the purpose of my visit, or any other questions for that matter. My interaction with the immigration officer was entirely silent except for instructions on where to put my thumb to have my fingerprint taken. I automatically received a stamp in my passport that is valid for 90 days.