LK Axe kick has a total of 16 frames blockstun then it’s 1+22 recovery. (2 active frames + 22 recovery frames, the first active frame doesn’t count since it is the one that connected) therefore 23-16 = -7 on block. On FADC it’s 23-18 = -5. E.Ryu’s forward dash is a total of 18 frames.
To test his, set E.Ryu as the training dummy and have your opponent as E.Ryu
Record E.Ryu one E.Ryu doing
LK Axe kick FADC forward and block
Then playback and try to punish it. You can’t punish it with E.Ryu’s sweep (6f) but cs.HP works (5f)
LK Axe kick FADC forward is -5