Given DePape is a QAnon believer and promoter, his specific goals could be anything up to and including QAnon's ultimate goals: Trump and his supporters performing a coordinated US-centric (but worldwide) takeover of political and military power, rounding up and executing all that he feels oppose him, and installing him as the ultimate despot/autocrat/dictator. Presumably the answers DePape would have demanded "the truth" of from Pelosi involved the Q beliefs that she is part of a secret cabal that tortures children and extracts their "adrenochrome" to be consumed in their satanic orgies.