Really? ...huh, while that makes sense & unless you going full beatdown, you'll kill their other effects as well except Susa's half damage effect.
So not *completely* worth the 2 Tribute Summon over say IMD or Mirror/Yada + Tailor/Fickle combo.
Could this card be used to avoid the effect of Man-Eater Bug (from Bakura lvl 40)?
Her effect is continuous, that's why. The same happens with Gravekeeper's Visionary
FYI: What it means by "monsters cannot activate their effects" is that, if you must confirm "yes" or "no" to activate a monster's effect, or give any input at all to start the effect like that, Angel 07 being on the field will prevent that from being possible.