21.1 BTC just moved out of addresses publicly attributed to Bybit reserve wallets (attribution: https://www.bybithelp.com/bybitHC_Article?id=000001880). The attribution is public documentation, not a SENTINEL measurement.
According to SENTINEL event ux_12k8z5b (source mempool.space): BYBIT: 21.1 BTC OUT. Verify: https://sentinelbtc.com/api/v1/events/unusual/ux_12k8z5b