I don't think TfL get this issue.
To go back to 1974, London was split into metropolitan roads and borough roads. The GLC was responsible for metropolitan roads alone but with support of London boroughs promoted the GLC General Powers Act prohibiting parking on the footway anywhere within the Greater London area. But they provided a means by which boroughs and now TfL could opt out for any roads in their area.
Disapplication of the GP Act does NOT of itself create parking places on the footway, it simply disapplies the footway parking ban thereby permitting waiting on the footway PROVIDED that there is not another provision restricting this e.g. yellow and, now, RED lines etc.
What TfL have done is:
To exclude those lengths of street(NOT just the footway but the carriageway as well) for those items in Schedule 2A.
But they have placed DRL there.
That's unlawful.
3. General prohibition of stopping
(1) Subject to the provisions of paragraphs (2) and (3) of this article, and of
articles 4, 5, 6, 7, 9 and 10, no person shall cause any vehicle to stop on a
red route during the restricted hours.
(2) Subject to the provisions of paragraph (3) of this article, and of articles 4, 5, 6, 7, 9 and 10, no person shall cause any vehicle to stop at any time on a length of red route specified in schedule 4.
(3) The controls specified in paragraphs (1) and (2) of this article do not apply in respect of any area of or length of road specified in an item in column (2) of the table in schedule 2A.
So, NONE of the 'lengths of road specified in column (2) of the table in Schedule 2A ' may be marked with DRL.
But they are!
My emphasis above. A 'red route' is the whole road and not, as TfL make believe, the carriageway alone.