Although I do agree with you - there are a lot of strong, powerful black athletes compared with (for example) more technical Asians in football and other sports.
I remember Michael Johnson presenting a documentary about black sprinters dominating, 1 white sprinter running sub 10 seconds, looking at survival of the fittest as a result of those who survived slave ships to north america..
Although it might have a racist tone at face value, it is true that there is a correlation with powerful players being black, but also for example Asians being more technical but less athletic / powerful.
I think it becomes racist when you start looking at a players skin colour and say 'you called him powerful because he's black' when it's quite fair and legitimate to describe powerful players as powerful - not taking skin colour into account.
Of course I do see what you mean, and a black player can be looked at and called powerful without seeing him outside of a photograph due to stereotyping.
For what it's worth, the most technically gifted player I have perhaps ever seen is Ronaldinho, and those of an older generation often say Pele.
Ndombele for me is a technical player.. but let's not pretend he wouldn't kick the shit out of Winks in every physical department too just because he's black. Recognising his physical qualities over Winks' primarily would suggest to me racist undertones.
I do think Ndombele is getting some harsh reactions, but I had thought it was because he's new, foreign and a record signing rather than his skin colour. Seem to remember a similar sentiment with Lamelas hip problem when he was supposed to replace Bale as our record signing.
Perhaps you are right though and skin colour has a part to play.. it's just not something I had considered before reading your post to be honest.
Suppose right now my awareness of racist matters within the Tottenham fanbase is at a peak following the Chelsea game.