No, not that post. That post is msg21143072, but the one with instructions for Pypy on WSL/Windows is msg21025074. Since you're having trouble finding it, I'll just quote the whole thing.
One of the dependencies for p2pool on Windows is pywin32. That's available on CPython, but it is not available on PyPy. The only way to get p2pool running on PyPy on Windows is to use WSL or a VM to avoid the pywin32 dependency. PyPy is about 3x as fast as CPython due to the wonders of JIT compilation, whereas the WSL layer only slows it down by about 1-5%.
Instructions below.
I tried installing pypy/p2pool on Windows myself, and while I got a bit farther than you did by installing twisted from source, I eventually ran into a roadblock because twisted requires pywin32 on Windows and pypy does not support pywin32.
However, I had better luck when I tried to run p2pool with pypy on the Windows Subsystem for Linux (Ubuntu for Windows). If you have Windows 10, I suggest you give that a try:
https://msdn.microsoft.com/en-us/commandline/wsl/install_guideOnce you have Ubuntu for Windows installed, run bash and then copy-paste these lines into your bash command line:
sudo apt-get update
sudo apt-get install pypy pypy-dev pypy-setuptools gcc build-essential git
wget https://bootstrap.pypa.io/ez_setup.py -O - | sudo pypy
sudo rm setuptools-*.zip
wget https://pypi.python.org/packages/source/z/zope.interface/zope.interface-4.1.3.tar.gz#md5=9ae3d24c0c7415deb249dd1a132f0f79
tar zxf zope.interface-4.1.3.tar.gz
cd zope.interface-4.1.3/
sudo pypy setup.py install
cd ..
sudo rm -r zope.interface-4.1.3*
wget https://pypi.python.org/packages/source/T/Twisted/Twisted-15.4.0.tar.bz2
tar jxf Twisted-15.4.0.tar.bz2
cd Twisted-15.4.0
sudo pypy setup.py install
cd ..
sudo rm -r Twisted-15.4.0*
git clone https://github.com/jtoomim/p2pool.git
cd p2pool
git checkout 1mb_segwit
Those commands should also work if you're on native Ubuntu or Debian Linux
You'll also need to install and run your bitcoind of choice
(I recommend btc1, because I think segwit2x is the future of Bitcoin) and edit ~/.bitcoin/bitcoin.conf with your bitcoind's RPC username and password (or pass it to p2pool from the pypy run_p2pool.py command line), then from your p2pool directory, run
pypy run_p2pool.py