They seriously are the record holders and here is a bit more information on how they conducted this experiment:

This video has been submitted to the Guinness Book of World Records for officiation.

The balloons are held in place by being weighted down with specially modified plastic cups filled with water. This prevents balloons that are popping from knocking other un-popped balloons out of position. The focusing lens used is from a soldering kit’s “helping hands” alligator clips holder. Also to enhance beam visibility a small bit of glycerin smoke was added to the air.

Note:  DO NOT TRY THIS WITHOUT THE SUPERVISION OF A PROFESSIONAL!

We hope you enjoy the video!