This flow has had restriction 2V for sometime and has not been just altered. I assume the OP did not realise that the restriction for Oxford was different than (for example) Birmingham & London
I didn't, but then I suspect that no normal-thinking member of the public would either, as it defies logic. People think of journeys in terms of a to b, not company a, company b and company c, with company c setting the fare despite only being responsible for a small proportion of the journey and not being used until well outside any conceivable peak period.
I will raise this more widely as, if nothing else, as Ainsworth74 says it may make more people aware of it, not least within my own organisation as we have a lot of travel to both Oxford and to Reading, which I assume (without having looked admittedly) is the same.
Btw I cannot be certain, but I am sure I would have used the 0922 for this journey last year and previously, as it reduces the number of changes and avoids the need to use ATW along the coast.