I suspect there’s some truth in this claim, but for two different reasons. The constant Never-Trumpers like Senators Romney, Murkowski, Lee, Collins and a few others, would almost certainly vote for impeachment and, given enough of them, combined with Democrat votes, could actually convict and remove the president. The other group would be those who believe that impeaching the president would be the death of the Democrat Party. I think either option is pretty damned dangerous and could lead to unintended consequences.
Murkowski, Lee, the Bishop and Collins would look out across the nation and see that 98% of republicans would separate their heads from their shoulders for voting for removal and reluctantly change their votes - yes, with a lot of handwringing, but change their votes nonetheless
No senate republicans are voting for impeachment