Perhaps Bitcoin will be adopted by central banks as a reserve asset, but nation states and their governments are unlikely to release their citizens from the noose of fiat debt slavery. Losing fiat hegemony weakens a government and its ability to leverage citizens wealth to embark on projects (like war) that build or defend the collective wealth and security of the citizens. You could argue the nation state is no longer requires but good luck trying that. You would be invaded the moment you tried it if you had any territory or wealth significant enough to attract conquest. Governments have always been fundamental to the wealth of nations. Because individually people are inherently weak and vulnerable when confronted by an organised group.

The angle the advertiser is using is people in India traditionally and culturally highly value gold as a SoV and showing one BTC is worth almost one Kilo of gold highlights the equivalency. Asian people generally have more open physical gold markets and a strong tradition of holding gold where buying and selling gold provides healthy competition with the states fiat. Early adoption of Bitcoin was strong in Asia because of this and especially large young internet native populations and often lack of reliable equities markets. But many Asian governments moved to limit and restrict this new competition with their fiat shitcoins coming from Bitcoin. Thailand, S.Korea and India in particular. More recently since Trumps second term some of these restrictions are being reduced.