The reason why they can't reach the rector of the MAEU is because he might have been arrested or is in hiding (https://www.myanmar-now.org/en/news/soldiers-raid-aerospace-...).
So, all in all, Japan is being careful and the situation in Myanmar is "undetermined". I think it is questionable where the "spying concern" is coming from, aside from being clickbait.
>Officials at JAXA could not be reached for comment. MAEU did not respond to calls seeking comment, nor did a spokesman for Myanmar’s junta.
It could be used for spying, because it's a satellite with cameras. If it has the capabilities to be used for spying is unclear, all the data would go through Japan anyway. Japan does not want to comment on it, persons responsible at MAEU are in prison or in hiding and the junta would probably lie anyway.