The answer is probably "unknown".
This article offers some information re USAF assets at DG.
Elsewhere there was mention of the fact that B-2's do not do well parked out in the open due to the special skin covering being sensitive to such exposure. That is why there are four B-2 Shelters (unless more have been built) at DG.
If Six or Seven B-2's were at DG in April/May along with B-52's and F-15's.....with the current tensions and hostilities between Israel and Iran one would think there would be good reasons to maintain such a posture as was taken in that time frame.
The B-2's based in the United States have flown combat missions in the area around Iran in the past as have B-52's so DG is just a secondary location for them.
https://www.airandspaceforces.com/ai...-garcia-b-52s/
https://www.airandspaceforces.com/b-...-diego-garcia/