If his face had that appearance due to a stroke, it would have that appearance all the time until it heals, which can happen slowly or quickly when it happens.
I asked Google:
“The facial symptoms of stroke often improve over time, although the recovery process may take months or even years. Some people with these symptoms spontaneously recover from paralysis and other facial symptoms at 6 months post-stroke.”
.
Yes, true.
I know that from my family, however, the Iceberg (big one) is still on the horizon.