Is this brake shoe legal ?

[Rawze]

There is no debate.

From the FMCSA USA -- ecfr.gov -- Here is the official ruling that have recently gone into effect as of aug. 17, 2018. It is found in section "393.47 - Brake actuators, slack adjusters, linings/pads and drums/rotors" ...
https://www.ecfr.gov/cgi-bin/retrieveECF....5.393_147

Some websites and links still have out of date rulings that differ, but this link I posted is the most up to date standard in effect for the USA. The rules in other countries may vary.