As the article says, handguns work well for bear attacks. Surprisingly, plenty of grizzly attacks have been repelled by 9mm handguns.
A good round for this occasion would be the G2 R.I.P. or the Civic Duty, which comes in several different calibers.
Repelled, I don't doubt that. Unfortunately the difference between a bluff charge and a bear intent on killing you leaves little time. One, maybe a second well placed shot to the nervous system. Personally I'd prefer a .44 though I carry a 357 in not grizzly country, with a hard cast bullet, I use Buffalo Bore. And I carry spray too. Not suggesting there's anything wrong with a semiauto, particularly for someone used to using one. Against a bear intent on harming you, I'd question hollow points. And short of a successful head or spine shot, a fatally wounded bear has 20 to 30 seconds to deal with you. Not a situation I ever want to deal with.