I have checked out the video and I under stand the process but the amount of layers to make up the weight difference would take forever, just seems highly unlikely. As well when heat is applied it does not change color. I set it on a brick that is on a wood stove and after a minute it did nothing but burn me when I picked it up, as it was kind of hot.
I was highly reluctant to do the drop test but found that formica is safe from chipping when I dropped the copper penny first and found no marks... but, I was also reluctant to drop the silver penny in-case it was real (didn't want to damage it) so I went to the bank today and got a brand new roll of pennies and took one out and dropped it and checked it for marks, found none. So I thought it would be safe, dropping them from about a foot off the counter surface. The copper penny makes a distinctive ting and the silver one makes more of a thud sound, so I dropped a silver dime and found it made a similar sound to the penny and yet different. So I dropped a 1970 nickel and found that it made a pretty similar sound but I think it has to do with the weight as opposed to the material its made from, or coated in for that matter.
I made an appointment with a respected coin dealer in my area for further investigation, I'll let you guys know what I find out.