Hi OzPahl and welcome to Orchid Board
Dtps seems to often be labled as Phal. I bought one the other day which was labled Dtps on the website I ordered from, but the plant label when it arrived said Phal. When I search on the web the same plant seems to be listed under both names depending where you look.
From my limited experience yours actually has more of the Doritas shape visible in the lip then mine, mine looks just like a Phal.
I saw a comment from another OB user the other day which indicated that Doritas plants have now been recatorgarised as Phals. That being the case it would make the Doritanopsis hybrids also get recatorgarised as Phal.
It really would not suprise me if that's where the confusion stems from. Orchids seem to keep getting moved between various genus all the time. Sometimes you can see the sence behind it, other times not.
I've kept my Dtps labled as that, although I will treat it just like my Phals.