While I'd take the metrics they talk about with a big grain of salt (they heavily depend on the specific startup being evaluated), the round sizes are in the right ballpark. Our[0] actual round sizes were:
1. Pre-seed: $1M (led by System.One)
2. Seed: $4M (led by Boldstart)
3. Series A: $25M (led by Tiger Global)
Note that all of these were all raised in 2021 & 2022 before the investment market crash, but even now I regularly see[1] rounds of similar sizes.
[0]: https://stellate.co