From what I see on https://eel.is/c++draft/temp.type as generated on 9th of November, 2024,

in [temp.type]-p5, p6,

the former explicits the sequence "T... [constant expression]", whereas the second refers pack-index-specifiers.

Why not wording p5 as follows:

For a type template parameter pack T, <del> T...[constant-expression] </del> <ins> a corresponding pack-index-specifier </ins> denotes a unique dependent type.