Hello! First post on the forum
The L of "hold" barely noticeably differs from Ls in other positions; in fact there is generally no difference at all. I can imagine that in fast, colloquial speech the L might be pronounced more in the back than usual (due to the previous O-sound), but it will certainly not become velar, like in English.
In the other word, "kell", the L actually shares every characteristic feature of the L in "kel", except length. That is, both are clear-Ls.
As for the linked audio file, it sounds unlike the way I speak (I'm from Szolnok, Jász-Nagykun-Szolnok megye, though my pronunciation is virtually no different to the standard).