For body axis I would agree but looks like I wasn’t the only trying to understand axes and the pep spreadsheet (looks like @madmax, @xan, @zenta were the prime suspects in that discussion thread):
Hexapod femur angle explanation - Help & Support / Robot Parts - RobotShop Community
and just for reference on the PEP spreadsheet: Project Phoenix Excel program + Manual - Lynxmotion / Legged Robots - RobotShop Community
Still reading through everything but 
Oh for the right front leg my tibia servo needs to turned to match yours will do that next.
@madmax looks like I am in the same boat as you were in with trying to understand the equations etc in Jan/2020 and earlier this year from that other thread