I found online article about How to Fix a Fluorescent Light.  Opinions?

That is nonsense.
The florescents start flickering and even the starter get damaged (90% of the time) from the tubes alone running EOL in the first place. So replacing the starter does not solve problem, It may hide the symptoms for a while (new starters may have the triggering voltage a bit higher, so still run the lamps in that state for a while without interfering), but the consumed cathodes will just make the symptoms return pretty quickly back again.

There's more to do with repairing the fluorescent light bulbs

In preheat fluorescent luminaires, it is common practice to replace starters and tubes together.