Allen Baum has some inside baseball on this:

  When the Microelectronics Group was transferred to Intel,
  that included the StrongARM Group. A month later, everybody
  in the StrongARM Group had pretty much quit.

https://youtu.be/wN02z1KbFmY?si=Gnt4DHalyKLevV2p

From 2:03:30 he points out that the only purpose of the DEC lawsuit was to facilitate the sale to Compaq without the microelectronics group.