Quite clear what Ben Purkiss was referring to and I might agree with AK had not Shearer, Lineker and Fowler all used the same type of sarcasm straight after the match. It does seem like plain bandwagon jumping and rather pathetic. I would normally say Kane should just brush it off but he probably wants people to draw a line after having their fun.
You can watch the incident time and time again from every angle and not be sure whether he got a touch with his shoulder. The still image in this article is the best I have seen but is a split second too early:
https://www.stokesentinel.co.uk/sport/football/harry-kane-purkiss-port-vale-1502460
It boils down to whether you think Kane is the type of man to swear something on his daughter's life (which I agree was not really appropriate) and still choose to disbelieve or question him.
I certainly think that Butland would have claimed the ball but for Kane's intervention.
Kane is clearly now playing with an injury so he has no chance of catching Salah anyway.