If you live in one of these countries, you will not be allowed to log in to wolfbet. But as far as I know, they don't have any restrictions on VPNs. You can use VPN if you see a country restriction message on the login page. This will solve your problem. But if it shows that your account has been blocked, you need to contact support.
BTW I am not recommending you use a VPN to get access to any gambling site. You can do it at your own risk.

In my opinion. If he is from one of those restricted countries. He should not use the platform. Even not try to use them with a VPN. Because, If the platform detects he is from one of the restricted countries. They can ban his account by confiscating his funds. The platform also reserves the right to ask for a KYC. What he would do if the Platform ask for a KYC? So, I guess it's better to suggest to him not to use it if he is from a restricted country.