Please quote the part of the article that sustains this allegation. What I read contradicts it:
Mr. Weiss said in a letter to Congress this month that he had not been constrained in pursuing the investigation. Mr. Weiss said in the letter, dated June 7, that he had been “granted ultimate authority over this matter, including responsibility for deciding where, when and whether to file charges.” He has yet to face more specific questions from House Republicans in the wake of Mr. Shapley’s testimony.
Then further down:
A spokeswoman for Mr. Weiss did not return a request for comment. In his June 7 letter to Representative Jim Jordan, chairman of the House Judiciary Committee, he wrote that he had “ultimate authority” over every aspect of the investigation, which seemed to contradict Mr. Shapley’s claim that he had said he was not the deciding official in the case. (Mr. Jordan subsequently sent a letter asking Mr. Weiss to clarify what “ultimate authority” means.)
In a short news release last week setting out the terms of the deal with Mr. Biden, Mr. Weiss added without explanation: “The investigation is ongoing.” It is unclear whether that phrase was just Justice Department boilerplate, a hint about the possibility of more charges arising from the inquiry or a shield against demands for documents and testimony about the Biden case from Congress.
The article does confirm that Mr. Shapely made the accusations, but not that Mr. Weiss confirmed them. If I'm missing the part that says what your Fox article claims, please quote it because I don't see it.