Techncians talk all kinds of nonsense regarding saxophone bore designs, and almost never based on actual measurements.
First of all, there is no single "bore size" for a saxophone, as it's a cone.
Secondly, that cone deviates quite largely from a true cone, especially in the neck and bow areas, partly due to the requirements of manufacture, and partly due to manufacturers' tweaking to improve intonation across the range of the horn. Of course, a large part of the surface of that cone is disturbed by closed tone holes which result in a very "lumpy" bore. I'm sure that is why the thing doesn't behave exactly like a theoretical cone, requiring said tweaking.
Often, when someone on the internet offers up a statement that "such and such a horn has such and such a sound because it's a large bore [or small bore] horn", I go to the one data base of ACTUAL MEASUREMENTS I know of, the Marten Postma site; and about 50% of the time I find the horn they're talking about is pretty exactly spot on the average bore size (down the length of the thing) for all the horns in the database; about 25% of the time I find that the horn they're calling "Large Bore" deviates from the average in several places, being SMALLER than the average; and only about 25% of the time do I find that there are data indicating that one could make some kind of an argument that the thing they're calling "Large bore" [or "small bore"] actually is what they're calling it.
In other words, pretty much the exact results one would expect from random chance.
I have learned to discount something like 99% of the big all-encompassing statements that techs make, as total and unmitigated rubbish; and the more authoritatively they make them, the more likely the statements are to be wrong.
"all old sopranos play out of tune"
"old Conns play out of tune"
"the set screws on Conn saxophones are needless and should be taken out and thrown away"
"This [holds up a Dolnet stencil labeled "Martin, Paris"] is a REAL Martin, before they were taken over by Wurlitzer and ruined"
"Holton saxophones especially are no good"
"You want to get rid of that [King Super 20; Conn naked lady; Buescher 400; etc.] they're no good, you need a Yamaha student horn"
"that little pad round back is the bastard key and the best thing to do is to take off the mechanism and throw it away, grind down the tone hole, and solder a penny over it"
Shall I continue?