The year was 1965. I heard "I Can't Get No Satisfaction" on the radio for the first time. OMG ! 59 years ago.
I raced home, grabbed my Silvertone and figured out how to play the riff in less than a minute. Ten minutes more to learn the chords. The internet didn't exist....YouTube videos didn't...
Martin Guitar headstocks are sorta non descriptive, but they sued Takamine.
https://www.premierguitar.com/pro-advice/vintage-vault/takamines-martin-inspired-acoustic
You beat me to asking the same question. The fact that he is unable to "declutter" the room is problematic. An empty room lends itself much better at determining the source of reflections. Square room? Rectangular room? Ceiling height? Every dimension matters. Wall, Floor, and Ceiling...
I discovered years ago that my dad's old banjo that I had hung on wall within my room was problematic. I removed the strings. End of problem. Didn't even need to search the internet for a solution.
Same here 'cept I've also done it at home. Place a single SM57 midway between the cone and edge of either right or left speaker of the amp and record it. It's not exactly rocket science to capture what the mic is actually *hearing/transmitting* to your DAW or standalone recorder provided it that...
? I said "HUGE" tones. I didn't say "PERFECT" tones.
There are literally hundreds upon hundreds (if not thousands) of internet articles and videos concerning mic positioning when recording an amp. Reading and watching YouTube videos is simply fine, but the key to successfully recording an amp...
For what's worth, IMO, it's possible to record HUGE tones from amplifiers whether or not they are rated at 5 watt or at 100 watt.
My recording room is 12' x 24', fully treated with absorbers and bass traps. The largest problem I encountered was the loudness of my amps whenever I recorded...