Sorry, that ain't it chief.
Strictly speaking, clean install means you install apps from scratch.
Copying/migrating apps across from backup means you are carrying across crufts from possibly generations of installs/upgrades.
Sorry, you are not in tune with the way things are, and have always been. As long as one keeps their applications up to date, there is not any "dirty laundry" (Of course, one needs to keep only the most current version). And by definition, the phrase clean installation,
in terms of Macs, means a clean, fresh installation of the operating system. That definition has been around forever.
Myself, I have
always done a clean, fresh installation of each new Mac OS. The migrations of apps again are for all my third party apps that are the
latest versions. And in each and every instance, whenever I have done a clean, fresh installation, then a migration,
all of my (up to date) third party applications work flawlessly.
I recently did a clean, fresh installation of Big Sur, V11.1, on a APFS-formatted partition on my Samsung 1 TB T7 external SSD, and then migrated files, folders, settings, apps, etc. from my Catalina-based, OS 10.15.7, late 2018 Mac Mini, with all my up-to-date third party applications. Well guess what? All of them work flawlessly (as expected). For Onyx, I needed to install the Big Sur version. That is the
only app I needed to do that for.