HEY! Don't dis us old gear users! That's also insulting people like Franlab, Mr. Carlson's Lab, everyone here who still uses an older multimeter, exc.
Yes, but I bet you don't use ONLY old meters as production tools.
I'm pretty sure that's what Franlab did with Frantone...
It's absolutely do-able, especially if you are recreating vintage style products. I mean they used old tools when they made the products in the first place. Even for modern things, as long as it is within the capability of the tools, being old is not in itself a flaw. The laws of physics have not changed much in the last 50 years, there were some very good multimeters, audio oscillators, spectrum analyzers and other gear made in the 1970s that is still as useful today as it was back then. It's just usually gigantic and may not be as easy to use as modern gear. That is all rather beside the point though.
Edit: Saw your later post, yes, innovating new ideas, probably not too likely, however as someone else said, if the video is 20 years old, then it's not unrealistic to find 20-40 year old tools used.
That said, I'm not claiming the guy has anything to present, I just don't think it's fair to rip on him for his tools. I mean if someone did discover some new energy source, it should be fully possible to analyze with 100 year old test equipment, we're talking pretty fundamental stuff here like generating electricity, which of course makes it all the more unlikely that someone is going to discover something new. The fundamentals of electricity have been well understood for >100 years, at some point we can reasonably say we understand something.