DCL falling over a defender who has slid straight into his path is definitely classed as a foul.
The thread is wrong, stopping a clear scoring opportunity isn’t an automatic red. TAA tried to play the ball so it isn’t a red.
I don't think it's as clear cut as you're making it sound.
There are two different phases to this situation.
1: DCL shoots and TAA slides in but fails to block the shot. At the point Alisson makes the save, DCL hasn't even touched TAA yet.
2: As the ball rolls away from Alisson, and into a position where DCL could theoretically now get to it and shoot again, DCL falls over TAA, who at that point is not making a deliberate move to trip/block him but is just there on the ground where he finished after his slide.
For me, that's two separate things: a slide to block which failed but wasn't a foul, and then simply being on the ground in a football match, which is also not a foul.
The only thing you could seriously consider as a foul is the little flick out with his (already naturally raised) foot that TAA does as DCL is passing. But by that point DCL has already basically fallen over and it's such a tiny movement I'm not sure it's relevant.
I won't argue further as I'm obviously chuffed it got given and we're into the grey area where it's all subjective now anyway. But I don't agree with anyone who claims that's in any way a stonewall pen.