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YEs, that is Highborne architecture, or night elven civilization architecture, whatever you want to call it. Suramar and Zin'Azsahri, Eldre'thaals are all examples of this.
But if you notice they're pretty much the same thing.
Notice how some of the buildings have wooden versions in a slightly simpler format in Val'Sharah among the druid society there. When it's druidic it is wooden and slightly simpler, when it's the other night elves it is marble.
Suramar is what they look like in a pristine sate, with all the arcane energy flowing, bejewelled etc, the ruins are you see are well ruins. Zin'Azshari you can tell is the capital of the architectural scheme, Suramar is a little bit special, Thalyssra did tell it's "the Jewel of the Night elf Empire"
I like the night elf stuff they've done, when I saw Suramar, it was a city that looked like it fit the description in the lore in the books and manuals. They did well, Zin'Azshari also looked the part.
now blood elf/high elf architecture we see in Silvermoon, is also quite nice, it has its own style. I would fully expect high elves to use that style just coloured blue as we see in some of the Northrend and Outland towns that have a mixture. However if they were to switch it up and give them something different, Skywall would be the sort of standard I'd like to see.
As said above, I fully expect High elf architecture to be a recolouring of the blood elf one as we've seen, however I wouldn't expect to see it use night elven ones. Blizzard tend to like to keep the two elven races a bit more distinct, though they do have some very intentionally left similar looking structures.
WE see them do the same in Suramar, mirroring what they have done in the lodges by having some structures there also resesmeble the ones the Thalassian elves use.. I think it is very well done by blizzard.. it shows us they are connected despite having a distinct feel and look to each. However do note, that it is the Night elven structures that make it across in the other elf group. We don't see the blood elven ones shared to the night elf.. which makes sense given the timeline.
Thalassians come after the night elves, they would have some night elven influences, but not the other way round, because of the story and the separation, when the exiled Sunstrider highborne become High elves, the kaldorei are in isolation in their forests and cities - the Thalassians then develop, gaining new styles, but would have some reminiscent of the Kaldorei ones replacing traditional moon and star symbology with and other assets like bestiary hippogriffs and Sabers with blood elven versions - I.e. Sun, Phoenix, hawkstriders etc. But players who are very faction minded, are self trained to focus on how they're different rather than alike - this is in part to blame for the special snowflake complex players have regarding elves, such that they expect and want their elves to be the only one of a kind in everything, and if their group has it, then the other shouldn't have it, cos it's mine, MINE !!. ROFL.