People of color are dying by the thousands right now from COVID-19, at far higher rates than whites. Businesses owned by people of color are devastated - again, at far higher rates.
Given we are in a deadly emergency, we progressives should have just two priorities:
* Battles where we can significantly improve people's lives
* Battles we have some chance of winning
Changing "slave" to "enslaved person" fails on both these counts.
And "enslaved" is a racist term - it comes from Slav, because this racial group was the most commonly enslaved at the time: https://languagelog.ldc.upenn.edu/nll/?p=41445
So it doesn't even clean up the language properly.
Articles like the one you are commenting on are always popular, because you can tell yourself you're doing something when actually you aren't. Talk is cheap and takes no effort - action is hard.