Sorry, your info is incomplete. Late last year, ICANN introduced a 60 day transfer lock for material changes to whois information as well. Material information in this context is Name, Company Name, Email (and a couple of other pieces of information). In the case of auction purchases, whois info changes which then applies the lock. Since this change takes place behind the scenes, you do not have the opportunity to opt out of the lock either.
Also, please do not forget, other registrars auction their domains through GD auctions too. In that case, there IS a registrar change