We need to read the TOS or ask them directly in regards to this matter if we are unsure. To be honest, what got my attention about this site is their no wagering bonus. 375% also looks kinda big. Pretty sure that I will check them later once I got home and let everyone know if what I think about it and their other feature. I hope this wasn't like the others out there which made me disappointed afterwards.
If you will read their KYC policy here - https://www.royalstarscasino.com/en/info/kyc-policy.
They do require to submit KYC docs with 3 elements of verification - ID, proof of address and proof of payment.
It states that the player should submit within 48 hours after requesting payout.
So yes, they will require KYC before you can make any withdrawal. Need to read the docs they need for each verification.
Do take note also that when you submit these docs, use the email ad that you used for your registration, otherwise, they won't accept and your funds are screwed.