Inactive or not, both Bungie and Blizzard sent e-mails out to all players along with multiple media outlets covering the deadline and warning players of the hard cutoff date. Migration began before Shadowkeep, and so, you had a little over a year to simply migrate your account, and both Blizzard and Bungie needed action on your end to do so. But here we are, and there's nothing Bungie can do about this since the deadline has already passed.