Even if it was poured as originally planned and passed inspection...then collapsed, is the City or County on the hook for missing some specifications during inspections? Hell no.
Did it have the required amount of steel/rebar reinforcement in the pours? 1 1/2” missing in a slab means rebar must not have prescribed clearance and distance from the surface and from each other. Just minor details. Engineer/architect will say it was over designed to begin with and less concrete makes it lighter.
I was thinking the same thing. This ain’t gonna be easy to “remediate...”