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Yes, it is.
why is the ui style so different? is this a newer version that I’m not familiar with?
Yeah there was a big overhaul of the UI with the release of 2.80. Then the devs just kept updating it and it’s past version 4.0 now.
Edit: but the white text box in OP’s meme isn’t a part of it.
Aren’t the icons in the middle usually colors? It’s this a theme, does blender have themes?
Blender has many add-ons so I wouldn’t be surprised if it is. Haven’t opened mine in a while but I also remember it with colours on these icons.