Buying at the dip is when you keep some funds and wait till bitcoin price dips before buying and that is not a good practice for a no coiner or low coiner to use without his DCA going on regularly.
Yes your explanation about buying at a DIP is okay but buying at a DIP is mostly for those who uses the DCA strategy and they have reserved funds that they can use to buy Bitcoin at cheaper price when a DIP occurs.
You must not be using the DCA method to applying buying the dip, those are two different approaches. The DCA method does not care about the price or the trend rather is involves buying at regular interval and continuously. On the other hand, buying the dip require that the investor should wait for price to drop to a level he might consider a dip before filling the orders. So, you can see that they are both different approaches use for accumulating Bitcoin. Although, both methods can be combined in for better results based on personal preference and this is where the reserve funds you mentioned comes in. While the DCA budget is left to run smoothly, the reserved funds can be used for buying the dip.