Personally Im not impressed by his stock.
With that being said YES HIS TANK IS OVERSTOCKED TO A DANGEROUS LEVEL.
First off Each fish in that tank is beautiful in its own right, However when you smash them all together like that it is simply disgusting. Saying "oh they are healthy, They look great!" Isn't necessarily a good way to excuse for cruelty and animal hording. If you Honestly enjoyed the fish or cared about them you would sell 90% or that stock. Saying something is Happy enough or healthy enough to thrive does not mean that it isnt cruel. Its similar to sticking you into a small room and feeding you healthy foods. Your going look healthy..... but are you gonna be happy.... Happy enough? Its B.S. Again if you honestly cared for the life of the fish you would give 99% of those fish that tank solo to make them more then happy enough to look presentable and not sickly. Oh and saying the Fish aren't telling you they are unhappy. seriously? grow up they are fish if your waiting for Flounder from little mermaid to tell you your fish need more room Then check below.
To be clear Im not arguing the following:
1. your fish do "look healthy"
2. you dont know how to take care of your fish ( you obviously have a lot of experience
3. That I know any more or have ever kept even half of these species however I im 100000000000000000000% sure you need more room
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Now : Open for flames
Look an expert showed up. Lol! Like I listen to you. Open for flames? Bring it on!!!