Hi. Sharpnull's instructions are correct.
You first use the original 2k20 patch on an original NBA Jam TE rom. That gives you regular NBA Jam 2k20 TE. Then, you patch 2k20 with that Alex Caruso patch.
Then play that "new" rom, and either...
1) beat all 27 teams or
2) at the tile screen, press Start to open the menu. Then use a Konami Code to access the expanded roster.
Here are the Konami Codes:
Up, up, down, down, left, right, left, right, B, A, start
Or
B, A, B, A, up, down, B, A, left, right, B, A, start
Assuming you are player 1, you can also use the following PAR codes:
7E169F:16
7E16A0:00