Yes, I concur with you. I believe in match fixing. Like we all know, this is gambling. Without any profit, I don't think there should be any reasons for match fixing, so to say it another way, yes there are benefits to match fixing.

Though some times it doesn't go the way they planned it, football is a game of uncertainty.

Besides,  this game is played by humans, and humans are not perfect, so mistakes are bound to happen.

Yes, assumptions are allowed to be made, but we need to be very careful of what we say concerning some games. Ok, let's assume Son Heung-min was involved in anything that you think happened behind scenes that day. Did he also tell the goalkeeper where he would play the ball or where to dive?
What about the match between France and Argentina in 2022 world cup finals ? Are you saying Kolo-Muani missed the late one on one chance he had with the Argentine goalkeeper because it was fixed? You should know this happens always in the game of football; that's why we have saves in the game.

 Pet meeting son to shake him was normal; at that point, I think Pep was overexcited because he nearly lost the game, and that miss from Son relives him so much, so for me, shaking Son was nothing but a congratulation.