Software updates rollout are affected via Region , eligible phone model and serial / build number.
And in some cases if the phone is branded i.e been supplied by a Network who wants to test the new software before allowing Samsung to push it out to ensure nothing clashes with their network features and own apps.
A phone having an Exynos or Snapdragon soc wouldn't in my opinion affect then a phone gets an update.
My phone which has the Snapdragon 865+ received the Android 11 and Samsung One Ui 3.0 update on the 4.2.21 which was in some cases way after people with the Exynos soc.
Some YouTube reviewers are supplied with phone's by the manufacturers to review hence they may have the newest updates on them already.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.