I can see that reasoning and it has some sense to it.
But does it justify what Trudy Harrison said?
The two things don't have much to do with each other. I'm not even sure if the UK typically has minimum parking requirements.
There's been a shift in the philosophy behind transportation planning in the last few decades: instead of focusing on moving
cars and trucks around (with the hope that this will indirectly allow people and goods to move around), the focus is now
directly on moving people and goods. Sometimes this movement will involve cars and trucks, sometimes it won't, but will never
only involve cars.
Societally, the change is mostly about economic factors and not so much about government control.
Mobility as a service, for instance, is being mostly driven by the private sector. Generally, the government is only involved because they're the ones operating a lot of the transportation services (e.g. transit buses and commuter rail lines) that a MaaS venture would want to include in their offering.
... but what Trudy Harrison said is right. The last few decades have taught us that auto-centric transportation and land use policies produce bad outcomes across the board: when you make auto travel the only option to get around, you saddle yourself with ridiculously large infrastructure costs, so you either have to have high taxes or do without other valuable services. You also create cities that aren't that pleasant to live or work in. And you don't even really accommodate drivers, because
induced demand kills the benefit of trying to accommodate drivers.
I'm a transportation engineer. I've done the studies that consider how a commuting corridor functions when you increase non-auto mode share: transit ridership, cycling, walking, etc. - all else being equal,
things get better for the drivers. If you're dead set on driving to work, wouldn't you want as much of the traffic that's currently slowing you down on your commute have other options that are attractive enough to them that they'll get out of your way?