I fear m'learned friend has gone a little over the top there. Having noted, no doubt correctly, that elected council members are neither required nor expected to clear obstructing vegetation from the highway (since footpaths and cycle paths are part of the highway), he has jumped directly to assuming it is therefore unlawful. Other views on that matter are available, such as
this from Cycling UK▸ :
Taking matters into your own hands
You are entitled to take reasonable steps to remove an obstacle in your way.
It would probably be reasonable to cut back overhanging vegetation with secateurs, or to break a lock on a locked gate, but it would not be reasonable to take away an unlocked gate, as opening it would sufficiently clear the path to allow you to pass. A highway user can only remove as much of the obstruction “as is necessary to exercise his right of passing along the highway”.
Removing too much, for instance by cutting back too much vegetation, is a statutory offence under section 1 of the Criminal Damage Act 1970, and the owner would be permitted to sue for damages.
Obstructions that cannot be dealt with at the time should be reported, either to the landowner or to the local highway authority.
You may also have a right to divert around the obstruction on the nearest accessible safe route.
A friendly reminder that a councillor acting independently may (though I suspect not always) not have any protection or indemnisation from the council, or their insurers, would have been more appropriate.
And isn't his job title - "Director - Democracy, Planning and Public Protection" - nicely Orwellian?