He says many things, but usually they are conditional or qualified outcomes.
The Senate really doesn't have any power to correct a dysfunctional House, any more than the House has the power to correct a dysfunctional Senate - no matter how harmful to the institutions or the public the dysfunction becomes.
And as far as impeachment goes, the Senate has no role at all unless the House walks over articles of impeachment.
A that point the case is all "it depends" on the contents of the impeachment articles.
And nothing stops the Senate from conducting a sham trial either. Wouldn't be the first sham perpetrated by the government against the public.
John Rogers will preside over the trial and can be expected to be a stickler for running it correctly.