Johnson is trying to be friends with everyone and not saying stuff that people could be offended by.
An anonymous advisor during his Mayoralty said that Boris never left a room before everyone in it thought he agreed with them.
In this case, I think he is being pushed (probably through leaks that led to detailed plans being published and "freedom" headlines) by certain groups in his party to open up faster than medical expert advice would recommend. Although he dealt with Brexit dissent by sacking MPs, the dissenters this time seem to be coming from the right, ERG, Brexity wing of his party which is now his core support, so he will be weak when dealing with them.
This can be seen by the areas that are most ambiguous. Exercise - pretty clear. Working - pretty unclear. I doubt the right of his party are particularly concerned about allowing people to exercise more but they do want people working and certainly off furlough.
What does really scare me (other than COVID itself) is the fact that furlough is masking the impending huge redundancies and unemployment that is going to occur. July is going to see appalling news on jobs, possibly unseen before in our lifetimes. The government will need to invest and spend unprecedented amounts for economic recovery and I just don't think this government has the stomach for it. Austerity isn't going to cut it, and if this is the route taken we will end up circling the drain.