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Switches are crazy expensive but optics are easily available... here's a 400G for less than $500

https://www.fs.com/products/110530.html

200G switches are about the cost of a small car, but if your buying this thing that is probably not a showstopper:

https://www.wiredzone.com/shop/product/10023793-supermicro-s...

I think it’s just a typo.

It's not "extremely rare" in the intended market. It'll still take you over 2 hours to fill this, if you manage to saturate both links (which you can't realistically do).

Doesn't most vendors sell switches capable of that?

100/200/400Gb is widespread in high-performance (HPC or big AI) datacenters.

Isn't 200G starting to become reasonable common for high-end enterprise gear?

Dual-port 10G/25G is fairly standard on servers these days, and SANs with multiple 100G ports aren't exactly rare either. I wouldn't be too surprised to see 200G or 400G ports on newer spine switches these days.