Covering tables for Pesach

Question

Following is a quote from Passover Cleaning Made Easy, by Rabbi Yitzchak Berkowitz. Is there any halachic basis for this, or is it as absurd as it sounds? http://www.aish.com/passlaw/passlawdefault/Passover_Cleaning_Made_Easy.asp The table itself will need to be kosher because you put hot food down on it. Of course, this is not always so practical to clean -- even though you can kasher wood by dousing it in boiling water, you don't want to do that to your fine wood table. Besides, tables usually have hard-to-reach crevasses that can be filled with crumbs. What should you do? Cover the table with something waterproof. Otherwise, if you put a hot dish down on your table, the moisture will penetrate your tablecloth, creating a direct line of moisture going from the table to your food -- making your food chametz! So the table must have a waterproof layer -- either plastic over the tablecloth, or the tablecloth over plastic.