@chrisjp the quote is actually from EE official website in the frequently asked questions of
https://ee.co.uk/bt
BT and EE are coming together to give you more
Does this affect my BT broadband, and will I need to change my contract?
Your broadband and contract will only change when you’re ready to move to new EE. We recommend moving to new EE so that you can get the best experience from us.