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I am learning about linux processes and having diffulty understanding how number of processes are limited by the size of task_vector

I am reading this page, https://www.tldp.org/LDP/tlk/kernel/processes.html

each process is represented by a task_struct data structure (task and process are
terms that Linux uses interchangeably). The task vector is an array of
pointers to every task_struct data structure in the system.

This means that the maximum number of processes in the system is limited by the size of the task vector; by default it has 512 entries.
As processes are created, a new task_struct is allocated from system
memory and added into the task vector. To make it easy to find, the
current, running, process is pointed to by the current pointer.

From above, I understood the concept of task_struct and that it is a data structure of process, and that task_vector is array of pointer to every task_struct. But on the following image, I don't understand what is task_vector. It also says it has 512 entries, does that mean there can only be maximum 512 processes?

Can someone help me out