Sounds to me that the author of the article does not know that about which he writes.
Yes, small changes in intake vacuum did/do result from removal of the air cleaner due to the restriction of the filter element.
Though technically a true statement, such small changes in intake vacuum resulted in imperceptible changes in carburetor performance prior to the advent of electronic controls in 1980 and beyond.
One with a vacuum carburetor synchronizer (once sold by JC Whitney and others) MIGHT have been able to detect removal of the air cleaner had there been provision to use the synchronizer with the air cleaner installed, but carburetors of the day, even sophisticated carburetors such as the Rochester 2GC, 4GC and Quadrajet, did not meter fuel accurately enough to compensate for the change unless the air cleaner was clogged or otherwise restricted.
Back in the day, we would remove the air cleaner/filter so that we could hear the Whaaaaaaaaa when we tromped on the throttle. Though we thought that we were now making much more HP, it made little or no difference if the air cleaner/filter was properly maintained. It didn't matter if it was Mom's 283 Powerglide or your first 389 tri-power GTO.
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