As I said, every peptide is different and will react differently.
Also, my example was Reta, not Tirz. Reta will most definitely react with salts. Tirz probably too, but exactly how and how much, I don't know. Also, not all salts are the same and all of them will have different effects on different peptides, buffers, residue in buffers, batches, and so on. Some may be ok, some not. Which will ahve what effect, is quite ahrd to know. Do a comprehensive peer reviewed research, and you may publish quite a few papers on this
Furthermore, Tirz absolutely needs not be dissolved in PBS (which is also not the same as NaCl water), but it can. However, it will perfectly recon in a typical sterile injection water too (with or without BA), so what improvement does PBS brings for Tirz reconning?
If the pH of the recon sterile water one uses is too low (i.e. too acidic), adding a touch of PBS solution may help, to increase pH. But what has that to do with NaCl water?
Also, MJ reconned solution in official MJ pens contains much more than just water, some PBS and Tirz, it has loads of various preservatives and also loads of other proprietary stuff, to let it live for months and years reconned in a pen...
But as always, everyone and anyone is free to do whatever they believe and/or find it works for them, so YMMV