The mob config options dont affect the mobs and all special mobs have the same health and armor when the "Apotheosis" mod is installed. Special Mobs spawn as intended but they dont scale with the modifiers from the config files (general.attributes).

MC1.20.1
SpecialMobs 3.1.7
Apotheosis 7.4.3
(ApothicAttributes 1.3.7)

Not sure if this is still relevant, but do you still have this problem with the newest version of Special Mobs and Apotheosis?

Even in a fresh modpack with only special mobs and apotheosis the issue still exists.
I fund a workaround with the mod "In Control!" from mcjty. I remade your changes to the mobs (stats) and they spawn with the changed values from the InControl config.
Still in 1.20.1 Forge.
SpecialMobs 3.1.10
Apotheosis 7.4.8
Did not test other versions.

Special Mobs spawn but their stats are like their parent mob. Maybe the issue is on the apotheosis side.
Thanks for asking again.

*edit: corrected Apotheosis version