Well, 4ed Infinite Worlds put Caliph at TL11 (with TL8 Biotech).
Yes.
Hence the "as well" combined with mentioning what TL Dyson Spheres were in 3ed
and the speculation that Caliph's unchanged TL between the editions is down to
editorial error.
Or, trying to put it another way...
Since the TL scale changed from 0-16 in 3ed to 0-12 in 4ed and the definitions/explanations/summaries
of each TL changed as well.
While the Caliph's technology is implied, like the date, to remain the same between the two editions (changes to other
parallells are mentioned).
One finds it not unreasonable to suspect that the 4ed TL11 is some kind of error.
Alternatively, I believe that Infinite Worlds assumes that those who are interested in the worlds originally presented
in Alternate Earths and Alternate Earths 2 will acquire and consult said books, where upon they will find not only
a more detailed summary of Caliph's technology but also a sidebar elaborating on how far from everybody and everywhere
is at the listed early TL11 and only a comparatively small group, The Rightly-Guided Stellar Caliphate, is at mature TL11
(with the added note that much of what it controls - space stations and colony worlds - actually have a lower TL
than the Earth-and-humanity average).
OR since 3ed Caliph was not capable of building Dyson Spheres and 4ed can be assumed to be att the same level
of technological development, 4ed Caliph is presumably not at stage of TL11 where it can build one either.