cppcheck reports "Redundant code: Found a statement that begins with numeric constant" for a 'using' statement

Understanding that this is not a ton of context, I have this line:

using GridType = Grid<boost::optional<float>, 2>;

for which cppcheck says:

Redundant code: Found a statement that begins with numeric constant.

I would think "false positive", but usually these analysis tools are smarter than me, so I wanted to check if anyone can think of why a statement like this could be interpreted like that by the analyzer?