I think that Dec 2004 storm is a good comparison to what we are seeing on some model runs, at least from the 21st century. Though the mega totals would probably be farther north than that one IF it were to play out.
The GFS, GGEM, prior Euro runs are unlikely/rare outcomes, but not impossible. High end totals like that are not without precedent in certain spots in the region. Whether or not any particular person here has seen that in their backyard before is not super relevant.