Theoretically but I am sceptical as to whether it would stand and also as to who is to "blame", as they say, here.
Everytime I contact Abellio, they will not give an answer. Based on this, I believe it to be mainly Abellio who are behind the drive to reduce bikes spaces.
On the 11th of August the said:
I can not confirm anything yet I'm afraid, details will be posted here: https://www.scotrail.co.uk/about-scotrail/new-trains when this info is available. ^AE
On the 1st of October they said:
this is not yet confirmed I'm afraid ^M
Given that the trains are now being refurbished, clearly the numbers of bike spaces have been decided. But they wont say.