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Where are you reading that from? in ASP?
It is in System Report from the About menu.

Screen Shot 2018-07-29 at 9.31.33 AM.png
 
Ok if you’re game... does that revert if you change the OS back to pre-patch? My guess is that version does not live in hardware but is loaded at boot time.
I'm pretty sure what that is showing is the firmware version, and the OS version would have nothing to do with it. But I'm not rolling back to test it.
 
I'm pretty sure what that is showing is the firmware version, and the OS version would have nothing to do with it. But I'm not rolling back to test it.
ok I would totally do it on my wife's machine but she is convinced the computers we both receive from the digital stork are of a different pedigree: hers are meant to remain hallowed, stable, unperturbed portals of light into the creative world while mine enjoy being reformatted, reinstalled, and generally played with constantly. Suffice to say I will not be able to use hers for a reinstall.

All you would need to do, however, is find a USB stick of at least 16gb, boot to internet recovery mode (command R on start up) and install the OS onto a flash drive. This wouldn't mess with your SSD at all but would reveal the nature of the fix. Can anybody do this? You'd also need to confirm that the 10.13.6 supplementary update would be pending and not included already. @johnalan you up for it?
 
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