If you're basing this off the analytics site linked... you would be wrong I think. The earned income amounts are only tracked while the user on patreon has it enabled on the website. BlueCat would've turned that feature off back in March and is why it shows that way.
To give two comparisons, Naughty Sandbox (
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) doesn't hide their patreon income and it is reflected on the analytics and you can see it on their patreon page, whereas Caribdis (makers of Eternum,
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) don't show their income but would've if you set the graph to 2 years you can see they did at some point and thus on their patreon page you can't see how much they earn.