The only items in that list that require less than 10 servings to get to 2000 calories are the ones with serving sizes that are twice as large. Not even remotely comparable.
Right off the bat, it's worth noting that Soylent has an unusually large serving size of 106-142g [0], compared to the products listed above which have an average serving size of 30-40g, and therefore position themselves as being 'better deals' because they can claim to have more "servings". But otherwise the nutrient ratios are quite comparable and it's disingenuous to suggest otherwise.
[0] https://faq.soylent.com/hc/en-us/articles/204409635-Preparin...
> Soylent has 20g of protein per serving, and most of the products listed above are also in that 15-30g of protein range and share most of the same micronutrients, so functionally they're about equivalent.
The point is that they have 15-30 g of protein per 120-150 kcal serving as opposed to 20g per 400 kcal serving for soylent.
The macro ratios are not comparable at all. Point me to a single meal replacement that has comparable macros. If it's actually cheaper I will gladly cancel my soylent order and buy that instead.