What he admits today has been known for a long time, but the fact is that in this particular case it is not only Bitcoin that is the problem, considering that ES is a country where the majority of the population is engaged in agriculture, which means that they work hard every day and that they may rely a lot on trade through commodity exchange, and less on money trading.
In addition, as president, he advocated the idea of BTC being something that will serve for cheaper sending of remittances, considering that they have a lot of expats, especially in countries like the US. As far as I know, Chivo ATMs have been installed in all major US cities, but old habits die hard, and the volatility of BTC obviously discourages many from sending money home that way.
Bitcoin can be a good option for payment, although you should always consider the fees and the fact that confirmations for on-chain transactions are not instant. Of course, LN is something that can overcome these problems, but I think that most people (generally) find paying with BTC complicated and do not see any advantage in it.