It’s possible to choose deleteselected and deleteunselected from the menu bar in the data sheet but there are no matching statements - is there a reason for that?
OK, I’ll blame it on the Christmas festivities. Cancel the above.
Looks like someone has been spiking the eggnog again. 
At one time I had the same issue. Who knew that “Delete Selected Records” menu item would be the same as “Removeselected” statement? I just suggested an edit to the Removeselected help page so that if you search for delete selected you will find the Removeselected page, and same for removeunselected statement.
Unfortunately, it’s more likely to be Alzheimers.