@Meister1981
have you looked up stepper motors on the web?
literally every single motor I see for sale looks like this
so I looked at mine…same as yours…
beside a proper strain relief looks like this
so the stepper motors provided by Langmuir do not have true strain reliefs as you call them…so Langmuir is correct in their statement…it is a protective coating over top.
the motors do not move…so there really is not a need for them…