No, it definitely is not.
And I don't really worry about it all that much, honestly. My four favorite letters in this game are "IMTU," and a fair amount of what's "canon" about Charted Space I dismiss as Imperial propaganda.
Here's something I wrote about the x-boat system several years back, in a response to post by
@Whipsnade.
In support of this, note that the two most common offices of assignment in the IISS per
Book 6 are Communications for Field Scouts and Operations for Scout Bureaucrats - the x-boat system swallows entire careers of would-be first-contact explorers and stellar cartographers.
Some of the canonical stuff about x-boat stations really breaks down for me when I figure out star types - many mainworlds sit well inside the jump shadow of their primaries, resulting in trips of several hours to a couple of days to and from the stellar 100-diameter limit. Running x-boats back and forth for refueling sounds kinda insane at that point and the
S7 tender's fuel probe makes worlds more sense in this environment. Likewise being perched on the edge of the system: if you want to make your x-boat system carrying sensitive financial records and correspondence maximally vulnerable to pirates or enemy raiders, yeah, stick it out in the Oort Cloud.
IMTU (

) x-boat tenders operate a bit beyond the stellar or planetary 100-dia limit, slightly trailing the arrival box for most incoming traffic - starships arrive to spinward of a planet's rotation so they can meet it rather than chase after it; conversely they depart to trailing, so arriving and departing ships rarely interact with one another. Tenders and x-boats are serviced locally from a comm office located in an orbital station or dirtside Imperial mission complex with its own flotilla of ships and boats, as noted above.