A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
It appears that the blogger you were referred to was a bit premature. This is an excerpt from the official Microsoft Tech Community Excel blog published in March. It seems to be applicable in regard to these new functions... apparently they didn't make the cut:
Availability
These functions are currently available to users running Beta Channel, Version 2203 (Build 15104.20004) or later on Windows and Version 16.60 (Build 22030400) or later on Mac.
Don’t have it yet? It’s probably us, not you.
Features are released over some time to ensure things are working smoothly. We highlight features that you may not have because they’re slowly releasing to larger numbers of Insiders. Sometimes we remove elements to further improve them based on your feedback. Though this is rare, we also reserve the option to pull a feature entirely out of the product, even if you, as an Insider, have had the opportunity to try it.
Microsoft seldom hesitates to announce new toys added to the Insider BETA Channel but rarely publicizes what they have withdrawn.