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That's not true - Windows 95/98 will crash on startup if you have more than one CPU core present. You could make it work on Pentium D/CoreDuo/Core2Duo cpus by disabling the second core, but nowadays with modern CPUs there's no option to limit the CPU to a single core. Unless there is some workaround for it that I'm not aware of.

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I've seen many BIOS that allow you to do that

I've never seen a BIOS not allow that. Often called "multi-processing" or something similar in BIOS.

I've haven't seen a bios that would allow disabling all cores except for one since at least intel 2xxx series - there is almost always a switch to disable hyperthreading, but a switch to disable all cores bar one?

From my own computer. Haswell CPU

https://i.imgur.com/5xPvoPA.jpg

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