Don't worry it's just they will remove the two optional parameters (forupdate and updatekey). it will be just one parameter (forupdate), so it will be findset(true or false).
if you want to remove those errors you can set something in the app.json file or force install of older AL extension
Answers
Do you know which parameter was deprecated?
https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/methods-auto/record/record-findset-method
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Meaning we cannot do a rename within a loop with FindSet ?
e.g.
Does this mean with runtime 11.0, this code will have to be refactored?
if you want to remove those errors you can set something in the app.json file or force install of older AL extension