They are magicly back now, yes it could very well be a wallet display error.
Of course you couldnt have known that the DEx would take more effort than you thought. Im not a coder so I cant build the DEx ive supported the project in plenty of other ways. If a thread on reddit leading up to something is littering all announcement threads then fine, if you dont do full research then.. I get it, it is all still being worked on.
That said, we do still plan to update it and work on Dogeparty. There are people getting involved. But that post above is correct, there isn't an existing full-time team working on it. This isn't a matter of not caring, it's just priorities.
About the functionality of a DEx well yea it is slow and not comfortable as compared to a centralised exchange however nearly all decentral things have that trade off. It lowers the access of entry for anyone that wants to buy or sell their assests.