Buying Bitcoin aggressively with the fund set aside for basic is one of the step for every Bitcoiner to sell at lost price no matter the good intention s/he has and no matter how people make wrong decision with their Bitcoin investment we can only make them understand the fact about how to accumulate Bitcoin profitably because even if you're Satoshi and you provide them the right guide they will still end up following their path.
Your response is a bit contradictory to me because how do buying bitcoin aggressively a step for bitcoiners to sell at lost. Anyways while i am still trying to grasp what you are saying, i can tell you that there is no such thing as bitcoiners selling at lost price while investing aggressively but i can put it in a clearer way for you. Buying aggressively can only depend on the size of your discretionary income such that you can chose to invest all without minding how big the amount is since it is still at the level of your discretion. It can also depend on how big your income is and how little your expenditures are that will tell if you will have enough discretionary amount to invest aggressively.
Possibly you might have omitted where he said buying bitcoin with money set aside for basic needs. The key words there is ( Basic needs). I think this is why you were confused with what @Suzanne5223 was trying to say. When reading a posts, it's better we are relaxed. We should not be in haste, or high with substances as this might make us not to read through the lines. Now that I have pointed out where you missed, hope you will go back to his post and see that he was actually on track with what he saying.
If anyone could say they are using the money earmarked for their basic needs for Bitcoin investment, then the person "may not" be planning well, Bitcoin should not be invested in a way that will affect your good living and that of your family. I quoted the "may not" because some people could sacrifice to invest in Bitcoin too, this is why I do not like to be too rigid in contexts like this.
We've seen people sharing good and motivational stories on how they endured hardship just to invest and their stories turned to glory. For instance, some people might need $1,000 for the monthly basic needs that will make them very comfortable for the week, but for the sake of investing in Bitcoin, they might cut it to, let's say $500 and invest $550. Is that money not coming from their basic needs? And didn't they invest at the same time? All these things have explanations, it all depends on how far you can go to endure committing money to your Bitcoin investment for a better future and financial security.