"War is just as much a necessity for the State as the slave is for society. The division of the chaotic mass into military castes, out of which arises, pyramid shaped, an exceedingly broad base of slaves, the edifice of the martial society...In order to make the production of the world of art possible to a small number of Olympian men". [Nietzsche,'The Greek State']

Nietzsche's vision of a 'Grand politics' pervades his work, and it does not work to take out of context those comments which are anti-German politics and anti-democratic/parliamentary politics, and pretend that he is anti-political per se.

But we still haven't answered the question.
How can Nietzsche, an admirer of purely political supermen Pericles, Julius Caesar, Cesare Borgia, Napoleon, et al, denigrate the German power politics of his own time ?

The answer is fairly simple. In all the former cases, political power was the servant of high culture. Power was a means to an end [and that is the the will to power as BECOMING]. To Bismarck, power was an END in itself. The anti-French tendencies of German nationalism exemplified the petty nationalism which he [rightly] saw as being destructive of European culture.It is that type of politics that makes stupid, just as democracy brings in the rule of the mob. Again, Nietzsche must be appreciated in context.

Rome as a political entity actually CREATED Europe. Rome spread Classical culture world-wide. That is the sort of 'Grand Politics' that Nietzsche AFFIRMS.

Nietzsche is not political in a Bismarckian, democratic way; he IS an anti-political German in that sense. But he is a political Roman, an admirer of Caesar and Napoleon; i.e., politics in the Grand Style.