The Twitter account you used as source is a far-right, pro-Russian troll. Not very trustworthy.
Of course, ukraine would probably have razed or reconstructed these buildings, but the russian way seems to be explicitly done as a cover-up and propaganda operation.
I really doubt they can afford that level of public spending in other cities, and I wouldn't be surprised to learn that these construction projects only cover a small portion of the destroyed buildings. To say nothing about the quality of the hastily constructed flats.