That is an erroneous article. The Doris Castlerosse ‘affair’ has been pretty effectively debunked by Andrew Roberts, among others.
Churchill’s reputation is strong enough to see off the gnat bites, in any case.
I just completed the Roberts’ biography of Churchill. He had access to documents that were previously not available to researchers. Roberts debunks addresses and debunks this rumor.
Perhaps this is an attempt to say - “If a great leader like Churchill had an affair, then Sleepy Joe attempting to finger bang an intern isn’t so bad.”