This is a nice proposal, but there's no actual mention of total proposed cost to build and test a complete unit. I have a strong suspicion it is massively more than an equivalent-cost renewable installation given that Indonesia is literally on the equator.
This is a recent presentation, apparently for Indonesia. I find it detailed and well presented.
I do not really hold much hope for new nuclear, as compared to renewables.
However, they do still have a case in less-sunny, dense urban areas (e.g. US North East, Japan).