Yes, and the sentence you quoted specifically said the $98,000 figure was using Tesla's batteries.

Ok, so assuming that you really do need ~60kwh and you must use Tesla's expensive batteries rather than the $8k package, that's still 21 + 3 * 8 batteries = $45k for a house in California. What is the other $53k spent on? Postage?

I didn't look into where the $98,000 was supposed to be located. I assumed they took the least-favorable location in the country.

In California. It's right there in my first post.

Maybe they assumed that the average American lives in Alaska and use their air conditioning 24/7.