according to https://mikrotik.com/buy/europe/croatia
the Pondi d.o.o.
is legit "master distributor" but their official site is http://www.mikrotik-hrvatska.com
Site you linked is listed among links on mikrotik-hrvatska.com so it is reasonable to expect it really is from them. Also the price of licence from mikrotik-hrvatska.com corresponds with mikrotik-routeros.net
Though, I don't understand how can they offer half price discounts... sounds weird to me.