Those ones linked aren't actually LDPE, they are the standard harder clear plastic ones. If you want LDPE you can just go back to the products list and you'll find them there for the same price.
LDPE are softer so easier to squeeze, both have their benefits. if im mixing bases/single flavours i use standard clear, for my DIY mixes i use LDPE as you get more squeeze out of them. LDPE ones have a narrow and wider nozzles also by the way, so make sure you pick the right ones. You can also get needle tip LDPE bottles, cant find them on that site though. we are getting them in at some point. They are really handy for some tanks.