I don't understand why you said that Bitcoin is not an asset but agreed that is is a store of value, my understanding of something that is valuable means that it an asset, I think that the two means the same thing. Firstly Bitcoin is a decentralized digital currency and because of it's potentials to reach ATH in every bull run, people started to hold it as investment, so that they will be getting profits on their capital. If gold and real estate are considered as assets because they are profitable I believe that Bitcoin should also be considered an asset because it is also profitable to hold.
He may refer to the purpose of Satoshi creating Bitcoin as a currency. However, people makes Bitcoin as a store of value and it becomes an asset as well. An asset is something which has a value and it is possible to earn profits in the future. This fits with one of Bitcoin's current functions. It isn't only used to pay something (goods/services), but it is also used for investment purposes. Since the price always grows from one cycle to another cycle, people can get good profits from holding Bitcoin. Yep, it is quite similar with holding Gold that keeps growing its value.
References:
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Asset : Definition, Types, and Examples-
How does Bitcoin compare to other asset classes?[/i][/url]