Yes this is all true ...
And ... why is it so?
The piece comes very close to blaming the people involved: their ignorant, media-obsessed, superficial etc as if it is failure of character of the people involved. In fact the piece comes dangerously close to exhibiting some of the very flaws it deplores: replacing systematic, thorough analysis with simple finger-pointing and blame-gaming.
The basic point is MPs and the overall system is selected by the electorate. Democratic politics was always tough (cf ancient Greece (where the very term demagoguery came from) but is even worse at the scale and complexity of modern civilization.
- Tens of millions of voters makes the collective action problem and principal agent problem exponentially worse.
- Topics are often complex involving expertise from a range of areas including cutting edge science or research and involving difficult trade-offs (how much should we do on climate change today vs spending on education vs the military?)
In short, the reason we have poor quality MPs, civil servants and media (assuming that is so) is for systemic reasons mainly related to the electorate that selects them or reads them.
(Of course, it is more complex than that, with important feedback effects i.e. causation in both directions. E.g. media helps shape the views and values of the populace which in turn influences what media is wanted. This is a bigger topic beyond the scope of this short post.)