They might be completing a BIng degree at a university that recognizes prior learning in the form of subject credits i.e. studying only the classes the uni deems necessary to award a BIng to someone who already has BTech.
I have a couple of classmates who did that to complete BSc Comp Sci after completing BTech:IT. In general I wouldn't be surprised if the engineering industry favours BIng over BTech, happens with most degrees in most industries even when there is often no concrete reason for doing so.
Thankfully that all largely disappears as soon as you have some actual work experience, BTech, BIng, BSc, PhD becomes irrelevant as experience accumulates.