No, it’s not.....but it’s not exactly the nicest customer email either IMHO. Of course if someone isn’t happy, that’s fine, and the onus is on the builder to remain calm and helpful, but I see both sides.
To me, looks like a normal nitro finish. Foam in the truss rod cavity? Come on, it’s clearly just to plug it, take it out if you don’t like it lol. ‘Things in the fingerboard wood’? What things? You mean the kinda whitish stuff in the Rosewood pores? Welcome to open-pore wood....it’s completely normal. Scratches in the back, yeah not ideal, but welcome to nitro, nobody buys a nitro finished bass and gets annoyed and scratches and bumps.
So absolutely bring up the fissure at the neck pocket, but to me, the initial customer email (with quite an attacking vibe quite frankly) was largely unwarranted. I wager that if the OP had led with only that as an issue (and not all the other unwarranted stuff), Adrian’s reply would have been more helpful.
Basically, choose your battles.
(Foam in the truss rod cavity 🙄 lol)
Si