Delete old entries of the event-log with PowerShell or CMD? (Not all of them | With period of time condition)

Please take a look at these two threads :

how-to-clear-eventlog-with-powershell-or-wevtutil

delete-old-entries-of-the-event-log-with-powershell

Some days ago some body stole my password of wi-fi and connected to it.
After connect he hacked my windows 7 pc through home network.
Something is so strange for me.
After hack he deleted all wi-fi logs for two moths ago.
I never do that because i even did n’t know there is a wi-fi log in my pc.
Check here for wi-fi logs & it’s location
How is that possible because people say you can’t delete event logs in period of time by command.
Just tell me how could he do that?
Does he have GUI access to my pc?
I am so confused because of this action?

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