This is actually VERY common in technology.
My entire career has been strongly linked to ETL, but I never heard "ETL" as an industry term until a few years ago.
The fact of the matter is that you've simply been doing the work longer than they've had a name in it. You can legitimately call yourself a pioneer in "Robotic Process Automation" and note that you were doing the work even before the current tools existed.
I know something like that would get my interest, and on the interview, I'd want to know all about it.
To represent it on your resume, put the entire time you've been doing the work under a heading, then date the inclusion of tools....
Pioneer in automated widget manufacturing, 2011-present
2012 - incorporated "autowidget" into our toolset, quickly achieved mastery with that tool.
2013 - adopted "widgetmaster" as shop standard tool...
2014- pres - "Widgetmaster professional suite became shop standard, trained, mastered and trained others.