The data on graphtreon is scraped directly from Patreon, it's taken from the below bit on the creators About page:View attachment 3600585
I always take the data on graphtreon with a grain of salt - both helius and steve posted their Patreon stats before and the trend looked vastly different from the stats on graphtreon. I mean look at steve's graphtreon graph you will only come to the weird conclusion that their earning is butchered on a certain date every month for some reason. Specualtion based on that may end up very misleading.
It is therefore at least as reliable as simply checking the creators page every day. The reason there is seasonality in the data is because most users renew on the same date as an artefact of Patreon's old billing method renewing all subs on the 1st of the month. When comparing between two periods you just do peak to peak.
In regard to Helius' data I presume the graphic you are referring to is the below:
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The slight variance in numbers, and the reason it's smoother, is because Patreon's creator page lets you apply an "Active Members" filter that hides paid members who have cancelled their subscriptions. Graphtreon by comparison will show these members until memberships expire which happens disproportionately around the 1st of each month.