I'd say victim of.
CRT can't overrule the government, so have to interpret the guidance as best they can, and they seem to have been quite on the ball with updating us following government guidance.
There are occasionally crossed wires between their twitter comments and their website, but I think that's down to individuals making things up on twitter!
I think you are confused about what a tier is. You personally can't be in tier 3, only an area can.
Areas - as defined by the government, not by CRT - are placed into tiers.
https://www.gov.uk/guidance/full-list-of-local-restriction-tiers-by-area
You are in Sandwell, which on the current list is in the "Birmingham, Dudley, Sandwell, Walsall and Wolverhampton" area.
If I remember correctly this covers your entire preferred cruising area, so the guidance to stay in the area isn't affecting you at all. What seems to be the problem?