Greetings,
Our database administrator asked how a SQL update was applied to their SQL servers. He gave me an extract from a SQL log that looks like this:

I checked and confirmed that we do not deploy SQL CUs or SPs through WSUS.
I also checked the WSUS log going back to the start of the year and found no SQL updates being deployed.
What would cause this? Might it be a Windows server 2019 update or an update to .NET framework?
Thanks
David Z