I think you are underestimating Earth's opponent Komorikiri. Komorikiri is very good at getting the 2-frame snapback on the ledge with Sonic's f-smash. Earth can snapping back with Pit's up-b instead of hovering near the ledge, but in both cases, Komorikiri will get the f-smash very often. Komorikiri gets the 2-frame a lot in tournament as well. People like Ally have lost a stock to an almost fully charged f-smash by Komorikiri. To also put things in perspective in terms of player skill, Komorikiri is ranked 3rd in Japan while Earth is 10th.
Also keep in mind that Earth seems to have a lot of trouble in the Sonic match-up. He opted to go as Fox versus Komorikiri during Umebura F.A.T before switching to Pit. As Pit, Earth got destroyed, when as Fox, he was doing quite well. He is probably learning the match-up like all of us does. Just because he is losing doesn't mean it's not worthwhile footage of Pit play. He's playing debatably the best Sonic in the world. Therefore, from watching, there are definitely things you can pick out in terms of what to do and what not to do as Pit in this match-up. Like for instance, do not recover predictably.
In my opinion, Earth recovers pretty predictably to begin with. He loses a lot of tournament stocks by being edge-guarded by players like Komorikiri and Ranai. This is one example of an edge-guard by Komorikiri during the Umebura F.A.T. I mentioned earlier:
https://youtu.be/kqfkdXzSsuM?t=568
Nonetheless, realizing that Earth isn't playing perfect is good because it means there are things to improve on for him and for us since we know that Pit is not being played to his fullest potential as of yet. However, Earth is the best Pit player in the world so there is definitely a lot to be learned from him even if he isn't playing at his best. Such things that can be learned include his amazing spacing, his knowledge of tempo, and good neutral game to just name a few.
After about 17:30, Komorikiri left and Earth began to play against 9B and Sygnuss. While the matches between Sygnuss and Earth are not to be indicative of the Pit/Diddy match-up, 9B versus Earth is as good as you will get for the Pit/Ryu match-up since 9B is the best Ryu in the world.
Afterwards, Earth plays 9B again at around 22:58:35 and during that segment, he also plays Hiraga, a Sheik player. After that, Earth plays against Share and Gazer, a Villager and Link player respectively, at about 26:04. However, I feel that Hiraga, Share, and Gazer, aren't on the same level as Earth as of right now. The best matches to look at are against Komorikiri and 9B, which I have given approximate times for. But in case you just want to watch Earth's Pit, I have also given approximate times for his other matches.