Even if he's 99 necro he'd still be 138. You don't get 139 combat til you're level 100.
When the day becomes the night and the sky becomes the sea, when the clock strikes heavy and there’s no time for tea; and in our darkest hour, before my final rhyme, she will come back home to Wonderland and turn back the hands of time.
"Max" is confined to Varrock so they won't be able to level up Necromancy through rituals or through combat without making the death guard and lantern.
"Max" can be Max again eventually, I guess, as he can still make ghostly inks and candles in Varrock to train Necromancy, amid they will be very slow progression.