That's correct - but the BJ job is still rather unpleasant in general on a 123. BT, DT. The spring compressor is technically only required for LCA removal, which is usually only if you want to replace the LCA bushings. Most everything else can be done with the LCA (and spring) in place on the 123 chassis. The 124 is a different story entirely, and I'm not sure about the 126.
FYI - you can rent the proper spring tool from Rusty (800-741-5252) or Performance Products. I don't think FastLane rents the spring tool,
AFAIK... (?)