I think this might fall into the category of conspiracy theory. But realistically it is feasible. A process called "solufluction". The condos are built upon reclaimed wet lands, which means that they are built upon a sand base on top of limestone.

A shock test out to sea could translate a seismic wave large enough (doesn't have to be that large ) to trigger the individual sand grains to move, becoming uncompacted and perhaps allowing salt water to begin filling the voids between grains. This lubricates the sand allowing it to move and become unstable. It could hypothetically make the foundation that underlies the condos to shift enough to trigger the already unstable structure to collaspe.

Problem, all other buildings in the immediate area are not as compromised as the collapsed condo, therefore did not respond similarly, or... the shock wave just happened to strike the shore (underlying sand foundation layer) just that part of the beach adjacent to just the collapsed, compromised condos (highly unlikely). This would take a confluence of unlikely circumstanit's.

This is the problem with conspiracy theories, too many what if's. Occam's Razor. Simplest answer is most likely the best. The condo was built incorrectly with the substructure for the pool not built at an angle to facilitate excess water drainage. Instead, as per previous reporting, it was built without this angle and water was allowed to pool. The pooling water caused massive deterioration of the supporting infrastructure.