As suspected the article indicates that IVAS will replace ENVG-B bumping it down until fully replaced...

Once the system is ready — which won't be for at least another year — it will will replace units' ENVG-Bs. That system will in turn trickle down to other units, bumping the ENVG-IIIs — which Potts said the Army is only just now starting to field — to units below them, and so-on.


https://taskandpurpose.com/army-futures-command-fully-operational