I fail to see how. He was a long divorced ex son in law. The benign Freddie portrayed in Bambertweets is somewhat different from the malign influence you've described him as being.
Its a tactic often used Jane, to change the focus away from Jeremy and to put the blame on others. Colin might have said those things, who hasn’t about their Ma in law

. But at the end of the day Colin has been honest Bamber hasn’t, Colin doesn’t contradict himself like Bamber and pretend now he loved her.