Yes, just going through this at the moment - dad's on the dementia floor of his care home which has restricted access by keypad - and main door of home has keypad so no-one can just wander in and out (quite rightly) - but I take him out each day and I can go in to see him any time.
It's a new legal requirement to ensure all aspects of care comply and are in the best interest of the person - not just are they 'locked in' (my dad wandered so I want his access to the outside world to be controlled) but to check if his care is in line with his lifelong values and wishes and that he's not being overmedicated to keep him 'under control', has he capacity to make decisions etc. And there will be regular reviews.
The LA link just had a long chat with me to get background, not officious or talking 'legalise' just wanting to know as much as possible to get a clear picture of dad's situation. She's going to see dad too, and will talk to the care staff - but has a deadline within which all this has to be done.