You didn't. The OP did, and I was commenting about that.
Read and write frequency is not an entirely predictable quality. You can probably say that it'll be used less than items in inventory, but how much less? Even if you strip the item down to the minimum amount of data, you're probably just saving a small string that potentially isn't that much smaller than the ID itself, assuming that the database isn't coded badly.
Yoshida's response was obviously simplified because he was talking in an interview on a generalist site. Context matters. You don't go much in depth in this kind of technical issues when you talk to that kind of crowd, unless the interviewer prompts you to. As a simplification, his answer is entirely valid, as it captures the essence of the problem. While it probably wouldn't use the same amount of data per item as the inventory, it still works essentially in the same way, with each piece taking up server storage and data bandwidth when accessed.
Knowing first hand the quality of the interpreters that went on the European media tour (since I was there myself, I have worked with them plenty in the past, and I understand Japanese well enough to catch mistakes), I can tell that I doubt something was lost in translation unless the site misquoted/mistranslated on its own. Since translating from English to French is extremely easy, the possibility of big omissions and mistakes in that part is very low. There were two interpreters working in tandem supporting each other so that any mistake made by the interpreter on shift for each interview would be corrected on the fly by the other.
No. I'm telling you that calling the Director of this game a liar without a shred of evidence is extremely rude, not at all constructive, and not too smart either, considering that you know nothing of how the game is coded.
Sorry, but this kind of completely baseless allegation is laughable. Final Fantasy XIV has notoriously a rather big team compared to most MMORPGs, and Square Enix has been consistently hiring for it through 2.0 to now. Which is unsurprising, since the game is one of SE's biggest recurring revenue drivers.
That's also why it gets three fanfests a year in different areas of the world, plenty of events, concerts, and big media tours in luxury venues like the one that just happened. That kind of thing doesn't happen for games with small development teams, budgets or "corporate weakness."
The only "issue" I see is people talking like they know what's going on, when they really don't.