GGumt it’s all opinion! To say that Starmer is running out of patience is an opinion.
I would say that he is happy and confident in his new role, after all, being in Opposition when we are having such a hard time as a country is usually a godsend for the other side.
To take the points in the OP one by one:
Every leader of every country is ‘winging it’ on easing lockdown, the results are unknown, but it has to be tried, we cannot stay locked down forever.
It’s only used ( the dead cat theory) to further discredit Johnson, in any case, Scotland, NI and Wales all eased lockdown regulations at the same time ( they aren’t seeking to help Cummings!)
Simply saying that Johnson has to ‘get a grip’ doesn’t mean that he hasn’t done, so far he and other ministers are doing all they can.
Ditto, saying there is no exit strategy doesn’t mean there isn’t.
The government have said all along that easing restrictions all depends on what then happens, and it will be done in baby steps.Caution at every stage.
Other countries are doing much the same.Starmer is the Opposition and has to be seen as opposing, that’s all it is.