Sovereignty is protected when no law can be passed that hasn't been agreed by the Council and Commission first. Commission used to decide what laws to propose and individual countries had a say on the Council whether to accept it or not. There was therefore a consultation period when governments could discuss proposals in their parliaments if they choose and in many instances unanimous agreement in the Council was required. Government Ministers in the Council decided to reject or accept and none would do so without specific agreement from their government. There was also 'opt out' options for laws for agreed periods of time if they were demanded. That could not therefore be described as 'loss of sovereignty'.
Seems like EU-speak to me, They are at it today, see VdLeyen a few days ago. And what if the Gov lies, see Heath et al.? The EU just gave Frosty 1,000 pages of the same one-sided obfuscatory nonsensical drivel a few days ago. After 4 years. Goodbye.
