How to implement an NoC (Network on Chip) in my DE1-SOC (Nios-II, Qsys)?

While that article is accurate, and Qsys does do those things, fitting 100 cores of NIOS on a DE1-SOC isn't realistic.

If not simply because of the NIOS core resource utilization, then because of the associated adapter and interconnect logic that Qsys generates (see Table 2 on page 11 of that article).

So if your answer to Daixiwen's question of "100 cores of what?" is "NIOS of course!!!", then the answer is no. Either don't use NIOS or don't use 100 instances.