Well, that is a good observation of the bitcoin price and buying tesla is very possible if you can able to store bitcoin within that year's range in your cold storage wallet. If you noticed, it begins in the year 2018 which is we experienced a massive drop after the new ATH comes in the year 2017. My conclusion is this, even bitcoin will drop, it will always end up at a higher price, and also as I see it here, it follows in a halving time.
It proves that holding your bitcoin is worth it to wait, after 10 years even though how many teslas you want you can afford it once bitcoin becomes more expensive in the market. Indeed, it is a nice graph, thank you for sharing this.