Actually the article is right, it says that that Go Your Own Way was a hit (not huge-selling but a hit) and it did reach a peak at the tenth position in the Billboard chart but as Ken Caillat is quoted saying it sold relatively little since it gained its popularity by slowly climbing the charts and being constantly present in them instead of being a sudden smashing hit.
For those interested here are the Top 40 weekly charts from the time frame in which Go Your Own Way was present in the charts:
https://weeklytop40.wordpress.com/1977-all-charts/