All RCT's are not created equal. Some sites just require a 'core' card that covers the first 13 modules. Those techs could be in that boat.
Some sites with exceptional hazards like Hanford, LANL, INL, etc have more robust requirements, such as the WHOLE RCT test battery, Part 1 '13 common core', Part 2, '19 Site specifics', and part 3, Oral Board. (In addition to the OJT/OJQ).
People that have only been at low hazard sites (like pCi/gm dirt work) are not aware of the more robust requirements, and could very well be surprised.