Born in the late 70s, so also mid-40s, I worked retail in the 90s and older pricing guns often used a raised · rather than one aligned with the baseline, so I didn't doubt that it might have been common, or even official, in the past, when I read it. Such guns would sometimes have “old style” alignment with the baseline for the numbers¹ too.
The “still in use today” part is quite definitely wrong though.
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[1] https://en.wikipedia.org/wiki/Arabic_numeral_variations#Old-...
Even in North America, old school cash registers printed their receipts with the decimal as the dot in that purple ditto ribbon colour. I’m also remembering ticker tape calculators were the same as well.
Unfortunately, I'm the sort of pedant who on seeing somebody state an incorrect fact with such certainty, I doubt the veracity of the rest of what they have to say. I wonder where the author got this idea from?