12.1 BTC just moved within 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_k7llys (source mempool.space): BYBIT: 12.1 BTC MOVED. Verify: https://sentinelbtc.com/api/v1/events/unusual/ux_k7llys