I feel like the "some" part of this is tied more to the "immediate" content releasing (IE, within the next 24 months). When looking at the content we either know or can safely assume is coming from the Zenimax teams the next 24 months, only some will be exclusive. Here goes: Ghostwire Tokyo (multiplatform), Deathloop (multiplatform), ESO expansions (multiplatform), Fallout 76 continued support and expansions (multiplatform), Doom Eternal Ancient gods part 2 and possible future expansions (multiplatform), Wolfenstein 3 (can go either way), Starfield (can go either way, leaning towards exclusive), Arkane Austin's next game (can go either way, leaning towards exclusive) and maybe even a game or two from Zenimax online, which could also go both ways, but if I had to guess will be multi-platform.
So basically, out of the 8/9 games/projects from the teams listed here guesstimated to come out in the next 24 months, most of them will be multi-platform and only some could be exclusive. And I feel that Wolfenstein will likely be multi-platform as well honestly.
Now, maybe it's just some copium here, but personally I hope the games are all/mostly multi-platform going forward but it seems that at least for the bigger games they'll be exclusive