In short, the stars Earth used to orbit have evolved greatly themselves and resemble "planets". This is mainly due to young stars losing their mass much faster than older ones. As a rule of thumb the older the star gets, the slower its mass loss occurs.
This is far beyond where the dogma is. They can't even figure out where brown dwarfs fit yet.
They are intermediate aged stars that straddle the zone between massive youngins, and old fart stars. They are stellar teenagers.