Well our fellow SDF member
@5unrise has a compilation video of the Fujian mobilization exercises on Eurasia Naval Insight. Not really sure what's "sloppy", other than perhaps the first clip with the armored marine troops driving close to the beach crowd. The clip is quite short though so it's hard to tell what the context is too. The fact is that in a realistic scenario there'll be encounters with civilians along the way. Anyway we didn't actually get much amateur footage on the ground, nothing like Ukraine at all where the buildup was all over Twitter for months.
As for the US Navy friend, maybe they saw something else for them to say it's "sloppy", but honestly it just comes off as a typical American "knock you down a peg" comment.
