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I'm sure this is correct.
In our case the original suggestion was for a medium gear 10, but personally I think a 25 without gear restriction would be more interesting, although there's no reason not to have both.
My own 25 pb was done on a bike with a bottom gear of 86" - not ideal for riding to the start of the H25/2.
To engage the maximum number of participants, put up as few hurdles as possible. Limiting the gear to 72" is already a barrier to entry, especially if single chainrings make a comeback and people start riding TT bikes with a bottom gear of >72" again :-)