Dear Querist,
Reversal is NOT required. There is not an iota of doubt, in my mind, specially in the fact & circumstances explained by you above.
Of-course, tax-payer must be willing to defend himself judicially if so needed. This is true for every situation (not just for issue under discussion here) where Dept. may take revenue-centric view though tax-payers holds different view.
While there is always a 'possibility of dispute', I do not presume 'possibility of dispute' by Dept. as '100% certainty'. In many situations, in my experience well over two decades, I found that Dept. officer/s have dropped their initial objections when properly explained.
By misapplying quoted circular for situation under discussion here, then, dispute can also be raised by Dept. even against GST paid for getting space / stall in exhibition, GST paid on Printers & so on & on. If if such exhibition are regular feature, then, all these will become recurring losses.
Then, question will be how much one can play "safe" (just because there is a possibility of dispute) specially when there are so many matters in GST where Dept. may take revenue centric views and tax-payer holds views contrary to Dept.
Needless to say, these are individual choices for every tax-payer to make, there is also cost involved for mounting judicial defense (if so indeed needed) and there cannot be hard & fast rule or universal approach.
These are ex facie views of mine and the same should not be construed as professional advice / suggestion