As much as I dislike their attitude, 'caught' is the wrong word here. You get 'caught' doing something that you where trying to hide. You can't hide the fact that you need to register to view videos, so you can't be caught.
So they were caught making TechCrunch not mention the required sign up?
So is that somehow ethically questionable to choose not to take down the login wall? I don't get it. I wouldn't sign in just to check something like this out and think it is probably a foolish obstacle to place in front of their potential users, but I don't get why it is somehow sneaky or whatever.
If you can't use the site without registering, it probably isn't a secret that you can't use the site without registering.
I can see using a phrase like 'called out' or 'called on their bullshit' or whatever, but I don't see how they were 'caught'.