The article says they've announced a recall, so I assume this advice is for people who have chosen not to send the car back yet.

edit: no, I'm confused. From another article:

> The Detroit automaker has recalled all of the roughly 142,000 Bolts sold since 2016 because the battery can catch on fire. GM has taken a $1.8 billion charge so far for the cost of the recall and has been buying cars back from some disgruntled owners.

[...]

> GM has said that when it is confident that LG Chem can produce defect-free battery modules, GM will notify Bolt owners in writing and repairs will begin. Once a repair is made, GM will provide an eight-year/100,000 mile warranty on it. In the meantime, GM has assured Bolt owners that if they follow three steps, the cars should be safe

So they're not ready to repair them yet, but it's unclear whether everyone has the option of a buyback or not. If not, I don't understand how they can be said to have 'recalled' all the cars.