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I will deinstall the banned addons, nop.
I hope 'nop' means "no problem" here, instead of 'nope'. Otherwise your visit here will be a very short one.
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But my question affects the migration from Openelec to Libreelec and has nothing to do with the addons.
We are not kidding about banned/blacklisted Kodi add-ons. Some are known to destabilize and alter main-core Kodi functionality, let alone the legal vs illegal side effects.
Can i update from Openelec 7.0.1. Jarvis to Libreelec 8.0.2. Krypton with the Updatefile from Libreelec? (Yes, No, Maybe)
Yes, but... With every major update (f.e. 7->8), there is a chance that new functionality will work differently, which applies to add-ons and skins. That's why the auto-update function will not auto-update to a new major version. Make a full backup first before upgrading to be on the safe side.