Get on the list, if we need extra eyes he'll hook you up.
But thats not an if.
CGL's proofreading Quality is subpar, especially in many cases that are rather easy to spot. I don't think there are many customers that debate that.
If it was as easy as you put it, the problem wouldn't exist in the first place.
Plenty of stuff in the complaining-threads that doesn't fall into this (" it's whether or not the editor agrees with the issues they report, it's whether he gets conflicting complaints from different proofers (and has to decide which way to go with an edit), it's lots of things") catgory.
There is really no point in debating whether "blank entries" or "missaligned lines in a sheet" are intentional or an error yet you'll find numerous of errors like this, in several of the recent books. And this type is both the most easy to spot and most irritating error for a customer, because it has a huge influx on playability of the provided Information.
If the guys "you" (abstract, not you critias in Person, except if you would happen to be the HR-Guy of CGL) work with and that are under you don't do their job in a sastisfying way, its "your" (again, whoever is responding for hiring persons for this task) job to fix this problem and
actively look out / ask for replacements. If you aren't doing this, then sorry i have to say, you are doing a non-sufficient job at what you should do.
And before any Freelancer feels wrongly insulted/attacked or w/e:
Please keep in mind the title of the thread is asking for opinions on SR5E products.
Not on freelancers in specific. I'm fully aware that most likely non of you have the right to hire externals by yourself.
Still, if any of you could raise this issue in /internal/ communications (again?), especially the part with the "People would do without CGL having to spend actual Money on them", this might help the case a bit.
Hearing something from a co-worker has usually a different weight in a discussion than ramblings of some random internetperson.