Mythic titan doesn't count towards POV quest

[Palms]

Also mythic titan energy is separate from regular titan energy. In other words, hitting the one shouldn’t interfere with hitting the other.

I would also point to this discussion from a previous thread on Mythic Titans.

Early Information on Mythic Titans [Part of The Beta Beat V33 & V34]

It’s not a titan; it’s essentially a global boss with unlimited health. It appears for a while and you do as much damage as you can while it’s up. Then it disappears again (event ends). Then you gets loot based on: Individual best hit Individual total score Alliance total score. Alliance tally Damage only counts if you do said damage while you’re IN that alliance. It doesn’t move with you.