I haven't heard of this Bitunix exchange before and how it became a solution for KYC. According to the link provided by JeromeTash above, this exchange is asking for KYC meaning you need to submit personal documents before you can able to use their service.
I'm not sure why they wrote it that way but there are other indicators they have an unverified tier (no mandatory kyc)
1. From their help article: https://support.bitunix.com/hc/en-us/articles/15666657422105-KYC-Tiers-and-Benefits
2. From the test account: -- never tested with B's but it's usually enough to peek at the withdrawal page unless the exchange is shady.
But yeah, they're just like other CEXs that could request KYC anytime. The withdrawal limits are also inflated and - something typically found on an obscure/lesser known exchange as regulators don't even know they exist.