If the plan covers travel for a specific elective surgery, then I doubt the employer would be able to discriminate between employees. Just for example, we only cover abortion travel for single women but not married women. That would run into legal problems.
If the plan excludes elective surgery travel and logging, but includes it for some selected surgeries based on the employer plan design, then the employer can exclude and include based on their designed plan.
It appears that there is an attempt here to apply a logical extreme. That if ANY elective procedure is covered, then ALL elective procedures MUST be covered. I doubt that is the way it works.
WW