Hmm, I’m not sure how you mean. If you optimize parameters they should be accurate to whatever you are optimizing to. I’m not sure that anything is ‘gone’
AnkiHub doesn’t cause any reset of card data, no. Unless you manually reset cards, or restore from a backup, but both are Anki functions and not part of AnkiHub directly.
But, either way AnkiHub doesn’t really affect your FSRS settings in either direction. FSRS is controlled purely by Anki, ultimately.
If the decks are already present in your collection, seeing this message doesn’t necessarily mean that anything is being installed, just that AnkiHub is going to double-check your collection. If the decks are already there, it won’t do anything other than check them.
To be honest, I’d have to maybe see screenshots if you can of the parameters before, and after, to be sure that they’ve changed. And, even then, it’s quite likely that it’s not AnkiHub that has changed them. It could be a syncing error with Ankidroid, possibly, but that would be outside of my area of expertise I’m sorry to say.
If it turns out that syncing across devices is resetting your FSRS parameters, you might reach out on the official Anki forums to see if one of their developers is aware of a bug or something similar.
Please let me know if that answers your question, and if there’s anything else I can help with. 