That was a really sweet clip .I assume there's some dedication to him since he's playing a major role. Plus, I remember how the Marvel's Spiderman episode "Venom Returns" had a dedication to Steve Ditko.
On a related note, I found this tweet from David Kaye.
(Incidentally I guess this confirms Zemo will be in the episode with T'Challa going back in time to WWII).