Might not be a bad idea to have the pressure manually checked when the concern is present..
but they have to remove the pressure sensor and install the manual gauge to do this test.
Im guessing since they have confirmed oil pressure is within specs,unless something kinky is happening,oil pump is probably ok.
they usually work or they dont.
My first thought would be to have the Instrument Cluster removed and sent to their qualified certified repair facility to have it checked.The fault may be internal in the cluster..sure wouldnt be the first time ive seen this..not on this model but on GM models...seen many internal cluster failures cause all kinds of concerns...
To answer your question,dont continue to drive this until this is resolved,if it is internal,yes you are going to ruin the engine.doesnt take long with low/no oil pressure to ruin it.