Anecdata?
The NHS have been fighting internal infections for years, e.g. MRSA. Covid-19 just exposed some of their inefficiencies. This was three or four months ago, the same managers are in place, I have little reason to expect their future performance to be better than their past, performance.
In fact your argument reminds me of the old police tactic when police corruption was uncovered. Investigations would inevitably be long and could only be discussed at the conclusion, i.e. kicked into the high grass. When, at the end, some negative facts came out, the current police chief constable would claim that was in the past and that things had changed, without evidence they had. However, things didn't change and that same story would be wheeled out years later.