As far as I know, yes.
My 3900X specimen now boosts to 4.625GHz, despite being limited to 4.575GHz even 1.0.0.3AB.
Based on a sample size of one, I cannot say if the method I use to fix it is the sufficient remedy on all specimens.
Technically it has nothing to do with AGESA version itself.
I'm confident that an official fix will be available at some point (soon).
...
It is quite simple, but not something which an average user can do, partially due to the lack of equipment.
I'll let AMD to elaborate once they have investigated and fixed the issue.
And as I said, I've only tested it on a single specimen (3600 and 3700X had no issues). Other reviewers had samples which were limited to significantly lower frequencies than mine, which did 4.575GHz peak at stock.
So I have no way of knowing if the solution will completely fix the issue, or if it is simply an improvement. Mostly that's why I don't care to be more specific.