If this technology is so great, why does the site not show any before / after examples? Let alone demonstrating that it does what he claims?

Exactly!

Counterpoint to lightbulb planned obsolescence: https://youtu.be/zb7Bs98KmnY?si=h-i2U3Q8YE5tHW7G

You have chosen wisely

More then you ever thought you needed to know about lightbulbs! (Including the fact that inconsistent light bulbs are not vacuumes, they just have no oxygen, so they heat up via normal connection)

https://youtu.be/zb7Bs98KmnY