I'm glad some other people noticed the player's lack of appreciation for the tilts. Especially on Squirtle...you cannot afford to completely over-abuse Squirtles aerials, his most valuable moves, given the inevitable fatigue (especially against a Dedede), and therefore you really need to vary up your approach with the tilts. He used the jab combo once or twice, but the last hit can be blocked by a quick player (same for Zard). I saw at least one or two u-tilts too, but Dedede is so huge that, like with Bullet Seed, in-close up-tilts at low percents can really help you with increased damage dealing, and with aerial setups (not so much a Bullet Seed trait, but still).
I think more importantly than anything though, which noone seems to have brought up just yet...what the hell was up with that Charizard f-air approach? F-air is NOT a safe approach for him, clearly, since the damage outside of that knockback area near the beginning and towards the top of the cone is worthless (not to mention the complete lack of stun). A better Dedede would've blown right through that with a b-air approach, or f-tilts, or anything really.
The guy obviously likes to play speedy and aggressive, which is good and well given that I've gotten a lot better at the game by understanding twitch-based approaches and pressuring, but he didn't have any understanding of the character's overall strategies, primarily evident in his skipping an entire Pokémon for no good reason (it doesn't matter which, frankly).
I'd wager the guy was one of those hardcore Melee players who's just now trying out PT competitively for the first time, and thinks that, like all the rest of those unaware of PT's strengths, Squirtle's aerial game overrides everything else about the team.