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These will be documented in the documentation for MapBasic v2019.
The list of functions now contains a full list of all MapBasic functions. Maybe we need to give that a closer look and consider if all these are still used. AreaV1() is an ancient function for calculating areas back in the first versions of MapInfo Pro.
AggregateBuffer() is one of the four new spatial aggregations that can be used in a query when grouping records. This lets you aggregate the spatial objects too. These are the four spatial aggregations that we have added:
I have suggested that we add the spatial aggregations to the section on Aggregating Data in the MapInfo Pro documentation.
I just checked the help for MapBasic v2019 and yes indeed the help for all the new Spatial Aggregate functions as well as SQL language changes are missing.
Till the time we get this rectified, I have attached the PDF export of our internal documentation for these new updates in v2019.ThanksAnshul