Too many points to reply to individually ...
Low Moor does not exist today, so any station which is built (and the new one won't necessarily be where the old one was for ease of access) will be, under the rules, a
new station.
This means that the restrictions on track gradient in platforms (though the relevant RGS requirement has gone and the TSI doesn't restrict non-high speed lines), track curvature, roll space, stepping distance, tactile paving, platform width, access, cross fall, drainage, evacuation, fire, staff accomodation, lighting, CIS, CCTV, help-points, shelters, fencing, parking spaces for MIPs, highway access, bike racks, sustainability, energy efficiency, etc. all apply
in full unless a derogation to standards can be agreed.
Network Rail can continue to use an existing station which does not comply to today's standards provided it is not
positively dangerous and it (NR) takes all reasonable precautions to manage the risks (so, on-train "take care" annoncements, mind the gap signs, the barring of certain rolling stock, etc.).
However, there are two sets of rules here: Infrastructure and Passenger safety.
NR must actively provide a safe infrastructure (e.g. not banging trains into platforms) but this can conflict (particularly on sharply curved platforms) with the requirements for Passenger safety (e.g. stepping distances).
In summary, NR would have to jump through many hoops to build anything like, for example,
Bushey, so it is easier to build a station that complies.
As to the whines about bureaucracy,
all railway rules are retrospective and were generally imposed by Governments bending to

outraged

public opinion - so it's your ancestors' faults ...