If it would be really the same, then /dev/random would be a symlink to /dev/urandom or vice versa.
As already quoted above, the updated manpage it’s still saying:
/dev/random is suitable for applications that need high quality randomness, and can afford indeterminate delays.
And it is up to the kernel to maintain this manpage.
Also also it’s possible to look up the source code on how /dev/random versus /dev/urandom is actually implemented in the Linux kernel. Documented just now:
Code Comparison - /dev/random vs. /dev/urandom
Code from end of July 2024.
It’s trivial to see (probably even for a non-programmer) that there are differences between /dev/random versus /dev/urandom.