You have a poor comprehension ability.
Your screenshot says about a single deal between Russia and Myanmar that costs about $400 million. Which means the deal includes both the Su-30s and other equipment like T-72s etc. Read the entire article, it also mentions about other stuff aside from Su-30 that are included in the deal. The source says, the two sides will negotiate a loan package for the said deal which means as of now Russia hasn't extended any credit and the money is supposed to come from Myanmar's own exchequer.
And no, wiki says the unit cost of Su-30s to be at $37.5 million while the news claimed it to be $34 million.
https://frontiermyanmar.net/en/myanmar-to-buy-russian-fighter-jets-in-deal-worth-more-than-200m