LinneageOS is displayed as THE choice of deGoogleing your Fairphone while it is probably the worst choice of the big and available custom ROMs in terms of deGoogle. LinneageOS just does not focus on it, not their goal. Discussed many times here in the forum, for example: Custom ROMs comparison?
Please check the forum for alternatives before leaving to this external manual. custom-roms
List of available ROMs: ✏ Operating Systems for Fairphones