That kind of advice does come up periodically, and the basic point is reasonable: rebooting a home router can sometimes clear temporary malicious processes or unstable states, but it is not a complete fix if the device is actually compromised.
What a router reboot can and cannot do
Can help: clear memory-resident issues, temporary glitches, and sometimes disrupt certain malware that does not survive a restart.
Cannot help: remove malicious firmware, undo changed DNS settings, fix weak passwords, or close exposed management interfaces by itself.
More useful takeaway
If someone is concerned about router security, the better advice is usually:
Reboot the router
Install the latest firmware from the manufacturer
Change the admin password to a strong unique one
Disable remote management unless it is truly needed
Check DNS settings and connected devices
Use WPA2-AES or WPA3 with a strong Wi-Fi password
Replace the router if it is no longer receiving security updates
A lot of media coverage turns “reboot your router” into a dramatic one-step solution, when in practice it is only one small part of basic router hygiene.
So yes, the headline is a bit dated, but the broader reminder about keeping network equipment updated is still valid.