The context in which it was said is important.
This is not the first time that cryptocurrency can be used to pay for goods. At various times, companies have announced the possibility of paying with cryptocurrency. Over time, these opportunities disappeared.
Obviously Musk is interested in the hype around the doge.
Musk is interested in hype not only around Doge, but also around Tesla, in which he has a stake in the business. So this hype will be directed at both the coin and the car at the same time. But this will not be of practical use, since no one will buy a car for Doge, just as it was not previously bought for BTC.