Conor makes Muay Thai fighters look awful because of they often lack good boxing ability.
Which Muay Thai fighters do you think would beat Conor anyway?
It's very difficult to get off good kicks or any kicks at all when you're being pushed back to the fence and forced into a defensive shell. Being pushed back constantly, forced to keep moving and to defend makes it very hard to get off kicks.
Conor's pressure is one of the biggest reasons he's so successful. He pushes you into a corner when leading and baits you into his left. His counters don't just come out of nowhere, he's setting it up long before he actually does it.
He cuts you off at the fence and gives his opponent little space to move. If you don't get off the fence, it's just a matter of time until you're knocked out. The only thing they can really do is try to move foward with strikes so they can get away from the fence because it's damn near impossible to circle away from it when he has you cut off there.
When his opponent tries this (move forward with strikes), he counters them because he was expecting them to do it. He makes his opponent desperate to escape the fence and when they try, they eat counters or just get pushed back again immediately.
Conor has talked about how Muay Thai fighters are easy for him because they're all stuck in the same routine. They're all so similar with their movement and Conor knows how to read it perfectly.
If anything, Conor is the one who's bad for the Muay Thai fighters, not the other way around.
You need more than just basic Muay Thai skills to beat Conor. There's a couple specific things Conor does that makes him a very bad fight for Muay Thai fighters.