Well the point is very clear, instead of an investors to be waiting to build up an emergency funds before starting his bitcoin journey, the investor can be accumulating bitcoin and at the same while building up emergency funds.
Most people may think that emergency funds is only for long term investors in bitcoin, even individuals that are not into bitcoin investment still needs an emergency funds.so not having an emergency funds shouldn't be a reason for not investing into bitcoin however not having a discretionary income or not being able to sort out discretionary income can actually hinder one from investing in bitcoin since it is always advisable to invest from our discretionary income.
Basically an investor can invest aggressively from his discretionary income, so before that it is important for you to earn or increase your source of income first, either at work or other sources of income. Once you have increased your sources of income, it makes it easier for you to be able to invest in Bitcoin consistently with the DCA method, of course, after your income is deducted from your expenses (food, taxes, bills, shelter, etc.).
Speaking of emergency funds, i personally would not recommend you to invest using emergency funds, it is important to understand that emergency funds are only used for emergencies, while to accumulate Bitcoin, you can use discretionary income.