I'd use the word arsenotolerant instead. The cells still preferentially utilize phosphorous when given the option. The prefix phile generally implies that they

I'd use the word arsenotolerant instead. The cells still preferentially utilize phosphorous when given the option. The prefix phile generally implies that they require such conditions to live, like a thermophile isn't viable at a temperature below (roughly) 40 C. This organism would have no trouble growing in the absence of Arsenic. =)