LCSC often has a lot of "factory overrun" type parts that they may sell once to clear out, so sometimes its not fair to compare prices.
However, yes in general their prices are a lot better than DK, especially at low volumes CL21A226MAQNNNE:
LCSC 20pc 2.45c, 1000pc 1.53c (40% discount)
DK 20pc 97c, 1000pc 44c (45% discount)
Part of this is due to low labor costs in china compared to USA. AFAIK DK is not terribly automated in terms of grabbing and binning the parts. Also DK will often double bag and add a dessicant (to certain parts), which again increases cost of low quantities.
BTW I would try to find the voltage/capacitance curve of that cap, there is good chance its garbage and has little capacitance above 10V or so.
I couldn't find that exact PN but here is a similar one:
https://www.samsungsem.com/kr/support/product-search/mlcc/__icsFiles/afieldfile/2019/01/29/Data%20sheet_CL21A226MAYNNNE.pdfLook how useless that thing is above 10V. This seems to be a pattern with samsung caps I looked up.