Eligius Pool Relaunched As OCEAN Pool, Raises $6.2M in Seed Funding

"At the start, we are already the most transparent pool giving you full visibility into block templates, generation payouts, miner stats, etc. As miners, you should have the ability to know what transactions you are mining with your hashrate. We are also the only non-custodial pool, making you, the miners, recipients of new block rewards directly from Bitcoin."

https://www.nobsbitcoin.com/ocean-pool-launch-6-2m-seed-round/
 

 How can both be true:

“Truly non-custodial”
“Minimum withdrawal amount” 

 How does this work anyway?
Do they run a parallel chain to keep track of block rewards ala moneros P2Pool?

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