If it means that then wouldn’t it have been God’s “purpose” to still be saving Judas, Pharaoh & anyone who had already died in their sins when Paul wrote Phil.2:9-11, since that passage refers to “every” one? In which case the author would have to agree to the possibility of postmortem repentance.
BTW the same book says:
“Gregory of Nyssa is particularly keen to ground his belief in universal salvation in Scripture: besides 1 Corinthians 15:28, he uses Phillipians 2:10…8…He even tentatively suggests that the words ‘under the earth’ refers to demons who will also be saved.9” (p.193)
- Gregory of Nyssa (1988), p.461; see also Ludlow (2000), pp.77-82.
- Gregory of Nyssa (1988), p.444.