if he is going the Patreon route, he really needs to do the standard stuff free, then offer additional content via patreon, to see what interest there is.
If he just goes full patreon, with his channel content, i imagine he will get virtually zero subscribers.
im not sure bog standard match review 10 minute videos once a week, are Patreon worthy, there are literally 10s or 100s of these types of channels all doing a similar thing with little variance in quality.