Quibbling.
“Eternal” includes more than our awarenes of time time, but from in time it includes all of the past as well as the present and future. The Lake of Fire is still in the future. When it will be occupied even the “past” while it has been occupied will not include eternal past.
Hell can be both forever and still not be eternal.
If hell can be both forever and still not be eternal there’s more than a snowball’s chance in hell!