Hello Henry,
the post you mentioned only says that the B310 supports 'VPN passthrough', but does not say whether the B310 supports VPN. As far as I know, it does not seem to support it. However, it is still recommended that you go to the consumer website or contact the consumer hotline for confirmation. Alternatively, you can enter your contact information in the following link, so that Huawei personnel can contact you:
https://consumer.huawei.com/en/contact-us/I hope this helps.