Yeah i wouldn't worry at all! Like you said they do have phases of having big emotional reactions and it really isn't uncommon for them to be speaking less at nursery when their around lots of other children especially those slightly older than him. Let them do their thing but I honestly wouldn't worry xx
It’s good the SENco is on it! 1:1 sessions usually need to be funded tho as they require more staff resources. I would ask the nursery if they can do a home visit - it can be really beneficial for some children to bring their two worlds together (and the nursery staff can see how he is in his home environment)
I think it’s really good how quick your nursery has jumped onto it. I think the term ‘SENco’ can really scare people. To me he sounds absolutely fine and like a normal 2 year old. Nursery’s do jump onto things very quickly as it’s in their duty of care. They will just be able to put more into place that help him manage his emotions etc xx