Well, since deo is just the Latin word for God while theo is the Greek word for God, I'm not sure the personal vs non-personal definitions apply. The problem with these labels is that they're fluid. The definitions of what "theos" was in the old Greek philosophical landscape we just as diverse as it is today. One of the earliest ones, Heraclitus is considered by many to be one of the first pantheists.It's not that your definition of "god" is wrong, but that "pantheist" is a misnomer (not your fault). Pantheists should be called pandeists since their god is more a deos (non-personal god) than a theos (personal god) - and therefore, using the definition atheist = not a theist, pantheists are atheists.
Also, the term was coined a long time before the idea of separating the terms existed:
(source: pantheism | Origin and meaning of pantheism by Online Etymology Dictionary)pantheism (n.)
"the belief or metaphysical doctrine that God and the universe are identical" (implying a denial of the personality of God), 1732, from pantheist (n.), which was coined 1705 by Irish deist John Toland (1670-1722), from Greek pan- "all" (see pan-) + -theism. Toland's word was borrowed into French, which from it formed panthéisme (1712) which returned to English as pantheism "the doctrine that all is god" in 1732 (there is no evidence that Toland himself used pantheism).
By 1895, the "Century Dictionary's" editors wrote that "Pantheism is essentially unchristian; and the word implies rather the reprobation of the speaker than any very definite opinion." Greek pantheios meant "common to all gods" (see pantheon). Other words used at various times for similar notions include panentheism, "philosophy founded on the notion that all things are in God" (1874), from German (1828), coined by Karl Christian Friedrich Krause (1781-1832).
There's also the term "panentheism", which is slightly different, and I'm probably more like that, but it confuses people. The terms you're using, they're always reflected upon and understood differently between people, so I just try to keep it simple.