It's confusing at best, and misleading at worst:
The development affects employees with both pretax and after-tax 401(k) investments whose high incomes made them ineligible for a Roth IRA and whose employers didn’t offer a Roth 401(k). When those folks exited their jobs, they faced a tax dilemma. If they rolled over investments into a Roth IRA, they would have to pay income tax on the tax-deferred portion of the 401(k).
???
I'd be wary of any article that tells you about "recent" IRS rules, without actually citing to the exact rule in question. The rule they do cite to relates to the myRA, which says nothing about rollovers. And note, you are eligible for myRA only if your employer does not have a 401(k) at work. At a first glance the modified AGI limits for Roth and myRA seem to be similar, so not really any advantage for someone whose income doesn't qualify them for a Roth.