what? can you translate that to common folk english?
On the half-inches:
I'm assuming that he's prepared to give measurements with a precision down to half an inch, and anything within a quarter of an inch of a whole number of inches will be rounded to the nearest inch, and anything outside that will be rounded to the nearest half inch, which is what rational people would do. Given that the distances are effectively random numbers, there's no reason to think that the rounded-to-a-whole-inch and rounded-to-a-half-inch cases would be equally likely. There are 6 such measurements in his diagram, four round the outside, and the two diagonals. None of them rounded to a whole inch, they all rounded to a half. That's 6 heads from 6 flips. The probability of that happening by chance is (1/2)^6 = 1/64 = 1.6%. Which makes the probability of fakery pretty damn high. It also has the whiff of "if I use more precision a lot, people will think I'm being more accurate", but on that note, the second example is the better one:
On the angles:
This is an example of the precision used is meaningless given the context of what's being measured. It's what some have dubbed "Ludicrous Precision".
External Quote:
Use of overly precise statistics to verify claims will often be a sign of pseudoscience rather than proper scientific method. This is particularly true when the statistics in question could not have realistically been measured to that degree (i.e. the margin of error is being ignored) or if they are subject to major fluctuation anyway.
--
https://tvtropes.org/pmwiki/pmwiki.php/Main/LudicrousPrecision
I used to have a different term for it, but I've forgotten what that was.
Star Trek's Spock is probably the go-to source of examples:
e.g. /Catspaw/ "Spock: Picking up life-form readings. 24 degrees, mark 7. Range 137.16 meters." - *two* people's locations are being specified with 1cm precision!?!?
or /Errand of Mercy/, where the writers even seem to be poking fun at the concept:
Kirk: What would you say the odds are on our getting out of here?
Spock: Difficult to be precise, Captain. I should say, approximately 7,824.7 to 1.
Kirk: Difficult to be precise? 7,824 to 1?
Spock: 7,824.7 to 1.
Kirk: That's a pretty close approximation.
Spock: I endeavor to be accurate.
One classic example caused my g/f & I to simultaniously shout at the screen "it that relative to the start of your sentence, or the end of it?!?!"
/The Immunity Syndrome/ "SPOCK: Slowing now. Contact in 18.3 seconds."
So the angles between these probably-feet-wide indentations are being given with a precision where the presence or absense of an extra grain of grit would mean the number should be changed. Even a degree (or half a degree, as he really seems to love his halves), would suffice.
Excess precision is usually used in order to appear smart and accurate (which is why it's a trope in sci-fi for such characters), but to those who understand mensuration it's conveys exactly the opposite message (and says "demonstrably bad writing" in the sci-fi context - actual smart people wouldn't say such idiotic things).
Combine that with the half-inch almost-certain-fakery, and my only conclusion is that it completely stinks.