People who make this argument do not understand that football is not the same now as it was in the 60s, and particularly do not understand that Santos's situation (and that of South American football) was not equivalent to a modern European club. A 'friendly' is a game that is not part of a competition and exists as its own entity. But that does not mean that it is not a hard fought or high profile match, especially back then, when Santos played a lot of out of competition matches, as that made them more money than playing in competitions.
Here is the Wikipedia page for the Santos game against European champions Real Madrid in 1959. Pele was already a world champion, and the game was greatly anticipated as it was to determine who the best club team in the world was, and who the best player in the world was. It was played in front of a packed Bernebeu and was written about afterwards by dozens of prominent journalists. Explain, logically, why the goal Pele scored in this game 'doesn't count'?
https://pt.m.wikipedia.org/wiki/Real_Madrid_5–3_Santos_(1959)