Roly1650
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First of all, the Fletcher-Munson Wikipedia Page, suggests that the ISO standards were affected in the LF region due to several factors. Anyways, notwithstanding that, those tests were made using speakers and here's what the Equal-loudness contour page said:
Sorry, the page you reference doesn't say that at all. It is pointing out the difference between Fletcher-Munson and ISO standards at LF and theorizes on what caused the differences, but doesn't reach any conclusion.