To think he's controlling her?

[Rosebel]

For background I dislike my BIL and don't know if that's clouding my judgement.
I have formed a support bubble with my parents due to having a baby under one. So we spent Christmas day with them and my sister, BIL and niece were invited for lunch. I was pretty certain my BIL wouldn't come but then my sister phoned my mum and said none of them were coming because BIL was being difficult and decided it wasn't safe for them to come.
He also doesn't like her going shopping because it's not safe (she works from home and he doesn't). Doesn't even like her talking on the phone incase she's tempted to visit people (which she wouldn't do).
My mum thinks it's a sign he's worried about her but me and my dad think it's controlling.
What's your take on this?
YABU =he's caring
YANBU =he's controlling

Wanting to go to the shops on her behalf could be worry as supermarkets are notorious for lack of social distancing (at least our locals are) but trying to cut off phone support/reduce her support circle when she is working from home so has little contact anyway would be a big red flag for me as sounds like he is trying to isolate her. Surely the more she speaks on the phone, the less lonely she feels therefore less likely to yearn to visit people.

He won't go to the shops for her. He wants her to get a home delivery and seems to think it's easy to get a slot
I'm worried about her but she won't discuss it.

controlling. If she won't discus it you can just let her know you are there for her if she wants to talk

The most important thing is to always be there when she needs you (whether she makes the choices/decisions you think are right or not) and from your post you sound like you are doing this by letting her know you are there for her which is positive, it can be upsetting for family and friends as even if she does come to a point where she sees his behaviour as controlling it could still take a long time for her to be comfortable opening up, even to someone she trusts for many reasons perhaps she loves him deeply and is hoping once Covid goes away his attitude to her having social contact will change, though like I said the controlling of her phone calls is out of line in my view regardless of pandemic. Im not an expert but sure some posters with more knowledge on possible next steps will be here to help soon.

Controlling.

All you can do is be there when she needs you and be supportive and helpful rather than critical (not saying you are critical but if she’s defensive have to tread carefully) - hopefully eventually she’ll open up and things will change. Good your parents are around and supportive.