Probably because their matchup thread is outdated.
1) His camping isn't that bad. Originally it was "Oh noes, laz0r blows up grenades!"
2) Relatively easy to read from dthrow (he may escape a regrab if he rolls away though. But since that is his best option, we predict it :x)
3) He has a "ceiling" that I believe HugS was one of the ones to describe. When your opponent knows how to dodge nair, it becomes a pretty useless move. When you learn the disjoint on bair and don't fall for it's gimicks or run into it, it becomes a rather useless move. When you learn to not fall above ROB (usmash) it's a rather useless move. When you learn his glide toss length, you learn to expect the moments he will glide toss. Fsmash was already a rather useless move xD. When you learn to SDI out of dsmash, it doesn't put you in a horrible place anymore. When you learn that ROB's weakness is against people under him, you learn how to juggle him.
Some characters have a move, and while "useless" it has its time and place. However ROB's are simply avoidable and when you avoid them - you don't get punished (EG: airdodge MK's uair, eat a dair).... a ROB shouldn't be getting nair KO's at 70%. Shouldn't be getting you into the air to juggle you with a dsmash, etc.
EDIT:
However ROB does have the tools to gimp Snake (fair, and dair if you cypher at the wrong time, laser, etc.) and while his camping isn't as strong as it used to be, it is still good. His grab game is still something to worry about, and his tilts aren't bad either. He's not really a character Snake should expect to hit much when he's off stage.