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Looks like good advice.
The Polyphaser stuff has been around for awhile, and is designed for this kind of use.
If you are in an area that sees lightning, you want a proven system.
And you want to follow all instructions closely.

Here's a discussion on eham that might put the fear of god in you.
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Unfortunately, those whose budget just barely covers a Bitx40 might decide to go without.
This one is good to a kilowatt, $68.99 plus shipping.? ?
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Plus multiple ground rods, #6 copper wire, ...
Gets worse if you have multiple antennas.

One of these gas discharge tubes might do it for cheap:
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but I'm not about to hazard a guess as to what's appropriate around lightning.
And that eham discussion suggests the Polyphaser thing is more than just a GDT,
has some caps in it too, and I have no idea what else.?

Anybody with a cheaper solution they feel is adequate for QRP levels?

I'm sure lightning could find a way to bite us here.
But being off grid with no landline phone has its advantages.

While in college I spent summers on BLM fire crews, once spent a couple weeks
in a tower spelling the regular lookout.? They take lots of lightning.
Had a special stool you could cower on in the center of the floor during a storm,
big honking glass insulators on the bottom of the legs.
Just sit there and watch the sparks fly about within the cabin a few feet away.
And then when it was over, the VHF radio still worked.

Jerry