This is solid advice for an engineer. And absolutely moronic for a businessman.
Choosing what platform to use is a business decision.
If you take too long to get it right, you will never get the chance to make a dime off of your work.
We are all working on limited time frames. It is far better to throw something together that works and rewrite later, when you're actually making money.
PHP is amazing at letting you write something fast and rewrite it into something more manageable later.