From your top link
"The company estimated total U.S. sales of light vehicles will come in at 17.3 million for the year" so that is estimated sales for the US not the World and is it for all auto makers or for GM?. I showed market caps so you should be looking at worldwide not US, and we should be sure it's separated by company.
from
General Motors - global vehicles sales in 2018 | Statista it looks like half that. So GM sold more like 8 million not 17 million and that quote from the article you cited was confusing.
Infographic: Mega-Merger Creates Fourth Largest Car Maker also puts it around 8.x Million not 17 million.
VW grabs global auto sales crown, but Renault-Nissan Alliance closes the gap (CNBC) and
Volkswagen delivered 10.8 million vehicles in 2018, eyes world No.1 spot (reuters) supports that.
Unfortunately all those sources are 2018 numbers and the quote you pulled from was talking 2019. But it's hard to believe that GM suddenly doubled their sales in 2019 vs 2018 when the trend has been down year over year for multiple years now.
if you are saying the comparison is 17m GM to .4m Tesla and the GM number is half as much that's misleading.
I'd like to know the time frame (2019 vs 2018, vs last 4 quarters), area covered (preferably worldwide not US), and know the numbers are accurate. I haven't made an argument other than asking for accurate data.