I tried to search the news for bitcoin. As given by you no information could be collected that bitcoin is illegal in Indonesia.
And where did he say that bitcoin was illegal?
He said bitcoin was not a legal method of payment, and yes that's 100% true.
https://www.internationallawoffice.com/Newsletters/Banking/Indonesia/Ali-Budiardjo-Nugroho-Reksodiputro/Mandatory-use-of-the-rupiah-in-Indonesia
yes bitcoin not legal yet in indonesian, i think it just many store in indonesian not accept bitcoin yet for payment... but if you transactions with people who knows cryptocurrency i think it permitt.... so sad about goverment not accept bitcoin though in fact bitcoin is new thing from modern world, but no worries in my opinion bitcoin will be use many people or all people in the world include indonesian for transactions