IMO it reflects poorly because Pep is telling him his ideas about why we lost a match are bullshit. How thinking winning individual battles is the problem is completely and utterly wrong.
To be the one player shouting about us losing because we lost individual battles and have the manager to say pretty much "no, that's bullshit, your idea of keeping it simple is wrong" in front of everyone isn't a great moment for him, and then Pep has to tell the squad not to focus on the bullshit idea of football being simple, but to keep doing the complicated stuff they've been doing all season.
Delph is basically falling back on the old dinosaur english 'stick it up em' approach when we lose, and after 2 years you'd hope that he'd be thinking more like Pep.
Hopefully he'll have learned from it. Overall I think he comes across really well in the series.