We've talked about these Diocletian fakes before, which range from the plausible to the absurd.
It's not totally obvious whether these are transfer dies or just modern. The bust is certainly plausible from Carthage.
In addition to these sloppy mix-n-match die pairings, another characteristic of these coins is the range of artificial patination, with some preference for lighter high-point highlights over a darker base.
There's been another pair of coins discussed on FORVM that seem to share these same mix-n-match and artificial patina characteristics, and would therefore appear to be from the same source.
In this case it's the reverse die that is in common, paired with either a modern obverse of Daia as caesar to create a fantasy mule, or a much more plausible Daia as augustus, that might be a transfer die. Multiple copies of each type have been seen, from these same two die pairings. The above two coins are actually from the same U.Gottingen collection !
The Daia as augustus version seems quite dangerous (as much as a low cost fake can be). In of itself it looks quite plausible, although none of the patinas exactly suggest authentic Alexandria. It's really the multiple specimens from this die pair, linked to the obvious fake, that would seem to condemn them. It's certainly been good enough to fool many experts. In addition to above one from from U.Gottingen collection (found by Lech) here are examples from CNG sale #352, and HJB current bid-buy # 218 (found by Din X).
The photo of the last coin isn't really true to life. HJB also provide a video which shows it to have strange glossy patina that looks considerably different.
It's interesting to compare the patinas of these coins to those of some of the Diocletians.