We asked Honor for the reason behind this action and this is what they said:
"\The unlock code application service was closed on May 24th for all Huawei/ Honor products as a security measure and to avoid issues caused by ROM flashing. The decision to close the page ensured Huawei/ Honor could continue to provide an excellent user experience for all global fans.
The unlock codes are available for download exclusively to XDA Developers on a first-come-first-served basis via this online form....Update: thank you to all that applied for an unlock code. We are no longer taking requests. Unlock codes will be sent out in batches, starting the week of 25 September and continuing until the end of the year. Further instructions will go out via XDA PM asap. . XDA users can apply for the codes using the form and all applicants will have the opportunity to share their feedback. It might take several weeks to receive an unlock code after requesting one, but we'll work with Honor to expedite the process as much as possible.
XDA will continue to work with Honor to give users a strong voice when decisions are made that affect their user experience. Finally, they had this to say:
Honor phones and systems have gone through rigorous testing and improvements, which is why Honor is able to offer great products at good prices for global digital natives.