User blog comment:B214/Shin DxD 1 discussion/@comment-95.210.189.106-20180809123512/@comment-28884330-20180810180857

But there’s no indication that it’s a permanent power-up, is what I mean. It was caused by the particles Nereid Kyrie releases, and since when Nereid Kyrie undid Issei’s armor it wasn’t a permanent thing, but temporary, there’s no reason to think D∞DBoost is permanent, rather being something that Ingvild activates each time it would be used.

It has to be reactivated by Ingvild every time it will be used, and therefore it’s a non-factor here.