Fox’s simple oil change/dust wiper service doesn’t reference float fluid at all and instructs using 7wt for both oil baths.
From the oil volumes table, float fluid is used in the air chamber (inside the stantion) not in the lowers..
That said, mojo probably recommend this as it has good (better?) lubricating properties and is easier to supply in low volume to the user as it comes in handy size packs.
Any attention/maintenance is a good thing although don’t rely on this simple service and think that you can avoid oil changes like these on the fox site
I’d compare the ‘lift seal and lube foam rings’ as simple service like lubing your chain, the oil swap is more like taking the chain off, thoroughly cleaning it, re lubing it and putting it back. Kinda