I would guess they like it against him because he's one of those characters who relies on his aerial game and spacing. The swords keep him from air dashing or throwing out the buzzsaw, its a really good move/zoning tool for keeping someone out.
Some notes on the QBee matchup.. Bee will crouch under standing roundhouse so its not as good to cancel into anymore. Also don't try to use c.mp or anything other than jab to hit her out of an iad. Meaty anti air If you land a knockdown and predict a jumpback on wake up, this is what skankingarbage talks about how bee players like to jump immediately regardless and leilei has a couple options to take advantage of this. I was playing shoultzula and he mentioned pendulums and trh overhead mixups are good against bee and generally if you have meter use it on TRH. (still loose like 50-0 vs him but I finally feel like I'm not overwhelmed by qbee mixup) Swords super would probably work well against her as well if you ever have space to use it