Consultant is unlikely to under design. More likely the main contractor or subcontractors cheated on materials e.g concrete strength or/and steel bar.

Investigation and report would take a few months. Project is likely to delay for a few years if ever to be completed. It could be cheaper for the main contractor, subcontractor or/and developer to declare bankrupt than dismantle and reconstruct the building.

Highly unlikely they'll do something like that... Developers are all profit oriented & using PV22 to compensate is not a wise financial choice from management POV...
No matter how long it takes, I think huge developers like PV will always win unfortunately...