Nope. Every rep range, can build strength. Let's put it this way.

You've been training at 5x5 and your 5x5 weight is currently 100KG. (This gives you an average max 1RM BS of about 130KG btw)
But you've stalled for nearly 1 month and just can't do 5x5 with 102.5KG. You've deloaded and loaded 3x and still fail.

Simple. Move to 5x3 @ 102.5KG.

So maybe now you've got 117.5KG x 5 x 3 but can't move up anymore. No matter how you try, you can't.

Simple! Change to 3 x 8 @ 110KG

Okay, so now you've increased your 3x8 @ 110KG to 120KG. You've got 120KG for 3 sets of 8 reps.

Think you could do 130KG x 5 x 5 this time?

This is how we mess around with the rep ranges and keep the body going "Shit, what the hell is wrong with my owner? Why's he doing this!!?"

Any rep range can increase strength. Even up to 20 reps for a single set.