Has this been confirmed to work with the Steam Deck?

I can confirm, at least from my usage. I've been using one in my Steam Deck for the past year and so far it's been working great, I haven't had any issues with it.

Questions & Answers: SanDisk 1TB Ultra microSDXC A1 UHS-I/U1 Class 10 Memory Card with Adapter, Speed Up to 150MB/s (SDSQUAC-1T00-GN6MA)

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SanDisk 1TB Ultra microSDXC A1 UHS-I/U1 Class 10 Memory Card with Adapter, Speed Up to 150MB/s (SDSQUAC-1T00-GN6MA)

Ideal storage for Android smartphones and tablets
Up to 1TB to store even more hours of Full HD video
Up to 150MB/s transfer speeds to move up to 1000 photos per minute
Load apps faster with A1-rated performance
Class 10 for Full HD video recording and playback
Compatible with SanDisk MobileMate USB 3.0 microSD card reader

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