There are two grounds to consider:
- recklessness of the tackle
- to what extent this is a goalscoring opportunity.
I don't think the force in isolation is enough to warrant a red. But he has to slide to reach him, which makes him less in control, and the risks are amplified when you're running at pace and so far ahead you cannot even see the challenge from behind. That is pushing a red for me.
It's not your typical last-man goalscoring opportunity, but Coventry have a 5v4 on the break there, with 1 man out of the game because he's slid to the ground. It's a decent goalscoring opportunity and they'd have to feck it up badly not to have a great chance at the end of it.
There's a case to be made that there are reds on both grounds. But even at a minimum, it's a yellow for the tackle in isolation and a yellow for the level of opportunity denied, so I have no issues with a red getting shown. That the commentator describes it as 'a good foul' suggests that there is a shortfall in the justice of the laws of the game. And why so many teams deploy tactical fouling as part of a wider approach. It's probably an area they'll tighten up in the future.