I just confirmed that searching for "hour" will highlight that term in the image in addition to any regular text.[1] Though, I first had to click on the image, which is apparently what triggers the OCR; after that searching found the term even if I changed or released the input focus.

This is my first time using this feature (your post reminded me that I had recently read about it), and my first time using Safari since I don't know when, so there may be more caveats to the behavior I'm not aware of.

[1] I used the archive.ph version of the full article. Live Text didn't seem to work when viewing the image in isolation via your link above.

After moving into a place where electricity is metered for the first time (beyond student living places where you just pay a flat rate as part of the rent), I started looking into what devices use how much. The '-hour' unit is so confusing, also when converting ordinary Watts to whatever-hours, you need to use a conversion factor of 60×60=3600 to get anywhere. Not intuitive at all. Had we just used Joules (kJ and MJ mainly, where 1 Joule = using 1 Watt for 1 second), then by using a 1 kW device (e.g. microwave) for 100 seconds you can instantly tell that 100 kJ is the amount of energy used. On a yearly a bill of 9'000 MJ, you can instantly grasp the relative size of 100 kJ = 0.1 MJ, maybe you do this daily so 365×0.1 = 36.5 MJ. I am terrible at mental math but this much I can do. Alas.

At least, that's how I think it all works, it's not like I ever got to practice this outside of Factorio (consumption/generation is all in Watts and storage in Joules).