The second sentence is intended to form a caveat on the first.
Buy a Voucher tomorrow (12th) and redeem it Saturday (13th) = eligible.
Buy a Voucher tomorrow (12th) and redeem it Wednesday (17th) = ineligible.
But it is poorly worded and leaves some room for confusion.
Again with the GV thing.
Yes Serfty your reading of that part is clearly the *intent*
however these T&C were inserted in the last promotion and we know how that has worked out for many.
I'd also note this wording(which is new) in the fine print:
Full or part travel of an itinerary is eligible only if you book (regardless of payment date) and travel within the promotional dates as listed above
"promotion dates" is 23/10-30/6/19. Is that the same as "promotion period"? I can sure argue a case that it is.
Now, what I have quoted again refers to "book now pay later" stuff, as specified on the page, but it's surely the same (in an operational sense) for GV usage.
It's clear what QF intend, but it's also clear what their system can handle.
Obviously things can change and their systems get smarter, and it's up to each punter how they want to play this.
I'd also note the travel by dates end June 30, 2019 - ie the end of the financial year. This is the very first time I can recall a bonus SC promo ending NOT 353 days ahead (ie: the Amadeus max booking window)... it's an interesting change, and may provide a clue as to what is driving this promotion (being so soon after the previous one, which in fact has travel periods that exceed 30 June, 2019)
my 2 cents.