Angle grinder abrasive cutoff disks *50% thicker* than specificied!

Is it just me, or is that WEIRD? Anybody who builds things considers a 50% difference in thickness to be a HUGE error.
Are all abrasive cut off wheels 50% thicker than specified? Is there any reason for that?
Talking specifically about the Dewalt four-inch cutting wheel.
(Amazon.com product link shortened)
The description says "thin .045 inches" thick. It measures .065 inches thick!
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