I would look into a better wifi connection if that takes that long for you
You can easily claim 4 prizes and click to the season tab and spend some sigils in 1 minute…
As for your math:
The person had 0, then claimed the 225 sigils obviously. Then spent 200 sigils and got 25 left.
The math in the review doesn’t have “glaring errors” as you put it. It’s correct