It’s true, though mostly I just hold th square against the piece and run the saw against it. If the blade is sharp and you hold well it works out. Interestingly. I own may squares inc the one pictured, they are all slightly different. I had to buy a calibrated one to figure out which was right.I use it for my jointer and table saw now.
I've seen people hold the square as a guide, and I'm just not that good with a circular saw to do that right. Much easier for me to just spend the extra half a minute or so and clamp a block down.
Edit: Also, I own three squares and often use more than one at a time to ensure I get similar results. All three seem to be 'square enough'.
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