MathematicalFunctionData and Digital Library of Mathematical Functions?

Questions
1

Yes there an example of MFD calling data from DLMF but when I try to go to other sections:

MathematicalFunctionData[
 Entity["Source", "DigitalLibraryOfMathematicalFunctions"] -> 
  "1.2(i)"]

or try:

MathematicalFunctionData[
 Entity["Source", "DigitalLibraryOfMathematicalFunctions"] -> 
  "1.2.1"]

It only gives me a list of math functions. Here is the official website: DLMF: §1.2 Elementary Algebra ‣ Topics of Discussion ‣ Chapter 1 Algebraic and Analytic Methods
Is the data incomplete or am I calling for other sections incorrectly?
Thanks.