I see that you mention portals, which are game play locations in Ingress. Ingress has split from Wayfarer, so if this player is tryihng to remove these in Ingress, they won’t be removed in PoGo. Any removals done in Ingress are only done in Ingress now, so they would have to remove the Wayspots via PoGo to get them removed.
More info about the split can be found here: Navigating the Niantic Scopely and Niantic Spatial Transition - Discussion
And if they are trying to remove valid portals in Ingress, you can report that abuse here: Reporting Abuse in Recon — Recon Help Center