Black, it is indeed black.
The 1.3 trillion mentioned in the "Alliance Plan" is actually not much of a problem.
According to the Empire's standard of one-tenth taxation, with a total population of ten trillion in the five-star systems, an annual tax revenue of one trillion is reasonable; the additional 300 billion comes from some worlds with higher levels of development, hence they pay a bit more tax.
There are quite a few planets within the Alliance with high levels of development, especially the two core circles of the Dragonhawk Star Domain that Gu Hang has managed for a long time: the Seven Horse Territory and the Yunluo Center, which are quite prosperous.
Some planets, with high levels of development, are required to pay higher taxes.