Yes it would mean that were it true. This is the infamous Fr. Wathen "dogma"; "Once a Catholic, Always a Catholic".
This is directly contrary to the Dogma that heretics are not in the Church.
You have a sede understanding of dogma, which is to say you don't have a clue what you're even talking about.
When an apostate Catholic dies, they are judged as a Catholic and will suffer worse than the non-Catholic because more was expected of that person.
You likely never read in the books that you learned your sede faith from, that the floor of hell is paved with the skulls of bishops, but that is how it is. It does not say the floor of hell is paved with imposter bishops, or non-bishops or fake bishops or whatever it is you imagine.