The Democrats' tax-credits for job training idea has been discredited for decades

Your response is one of the typical issues with American politics(and debates in general in this country)

The attack isn’t on “training people”. Training people is a great idea.
The attack is on offering tax credits to employers to train their employees.

Empirical data has repeatedly demonstrated that tax credits to employers DO NOT result in positive results for ANYONE, except maybe the employers.

“I don’t like articles that say something is a failure or a success”

So basically, you judge things based on their narrative power? If you think a program SOUNDS like it should work, then it should work. Evidence be damned. Why did we even bother to invent science.
That kind of thinking gives us shit. That kind of thinking gives us homeopathy, school vouchers, and a privatized FAA.