No. If you re-install an older version of IPFire the addon will still be shown as the latest version.
Probably worth doing but as there is nothing highlighted in the QEMU gitlab issues section on this or the passthrough issue from the other qemu post (based on my searching for phrases) it would also be worth raising a bug in the QEMU Issues section.
https://gitlab.com/qemu-project/qemu/-/issues/?sort=created_date&state=opened&first_page_size=20
That way if they can identify what the problem is and create a patch fix for it, we can then apply that patch.