It is ''unbelievable'' because it is not true. Similar to pretty much all the bogus blog stories that get posted here. Some folks are pretty gullible, I guess.
Go do 3 minutes of your own research. You'll find:
http://www.epa.gov/lead/pubs/sbcomplianceguide.pdf
And you'll see that if you're disturbing less than 6 square feet of interior paint, you don't have to do a thing. Go ahead and replace that door.
The rest of the story is bogus too. A EPA-certified lead test kit costs $50 for 16 swabs. Why quote lab test prices?