Yes you're seeing dye that's dissolving out of the emulsion. You'll see a similar thing if you presoak certain films (FP4+ 120 for instance) - it can be a shock the first time you experience it! Trust me, PE knows a lot more about photographic materials than you, me and most of us on here. APUG is a great place to ask and learn stuff, but some of us don't tolerate fools gladly... :-)
If your blacks are coming out blue on your prints per your OP, your developer is getting exhausted (iirc) and needs changing or replenishing. It's nowt to do with dyes not being washed away...