It takes some work to get details but the update appears to be an update to the Lenovo Power Manager. You can view it in Device Manager as System Devices\Lenovo Power Manager\Driver which shows as version 10.0.137.0 with date 4/16/2021.
Looking at the Driver files shows that all the DLL files carry that version number. The update automatically installed on my system on 5/28/2021 7:32 AM. Checking the base driver file yields for version, viruses, and install date yields:
C:\Windows\System32\Lenovo\PowerMgr\PWMIF64V.dll:
Verified: Signed
Signing date: 12:30 AM 4/16/2021
Publisher: Lenovo
Company: Lenovo Group Limited
Description: ThinkPad Power Manager Low Level Function DLL
Product: ThinkPad Power Manager
Prod version: 10.0.137.0
File version: 10.0.137.0
MachineType: 64-bit
VT detection: 0/74
VT link: [https://www.virustotal.com/gui/file/bd431e8bb1d0e98b5e2109b7227b4988dd92c148dccd52b7edc07482dec190a7/detection](https://www.virustotal.com/gui/file/bd431e8bb1d0e98b5e2109b7227b4988dd92c148dccd52b7edc07482dec190a7/detection)
C:\Windows\System32\Lenovo\PowerMgr>dir /tw
Volume in drive C is Windows
Volume Serial Number is 3C0C-2F2B
Directory of C:\Windows\System32\Lenovo\PowerMgr
05/28/2021 07:25 AM <DIR> .
05/28/2021 07:25 AM <DIR> ..
04/20/2021 02:20 AM 1,002,168 PWMIF64V.dll
1 File(s) 1,002,168 bytes
2 Dir(s) 272,099,688,448 bytes free
Note that the containing directory write timestamp matches the install log time.
Checking all executable files in C:\Windows\SysWOW64\Lenovo\PowerMgr shows all files are signed and have no virus detections.
On Lenovo support site the Lenovo Power Manager Driver for Windows 10 is shown as version 10.0.134.0 released 21 Jan 2021. At bottom of that page it shows Last Modified Date: 30 Apr 2021.
Just a guess but it appears that Lenovo is releasing update via Windows Update before updating their own site.
Hope this was helpful.