You should always include the link where you got your info from, especially if you're going to write it exactly as it's written there - https://cryptoprofits.substack.com/p/gold-and-bitcoin-prices-the-surprising
Not including the source of your information can be termed plagiarism, especially if you don't state it's not your original content.

On the correlation between gold and Bitcoin for it to be taken into account, one would have to correlate the relationship between Bitcoin and other assets as well as gold and other assets. A positivemarket usually affects many assets in the same way leading to same results.