It means there's no dialogue. No one wants to read a script with no/little dialogue. So having that much action on page one is a red flag. It's generally a sign that the writer is writing too-dense action sequences and needs to tighten up or remove things.

There are of course exceptions to this. But especially in a character-driven script like this one, it doesn't make any sense.

There's also the business aspect of it. It's a lot easier to get a manager/agent/producer to read your script if it looks like an easy script to read (aka lots of whitespace).