I really doubt that. For many reasons, really, but mainly because the timeline doesn't match up. From the Symphony X Wikipedia page: "According to singer Russell Allen, the band entered a short hiatus during 2017 in which they did not perform, due in part to his commitment to Adrenaline Mob, although it was announced during a January 2018 interview with Metal Nation that the band had plans to get together in the following months and begin writing a follow up to Underworld. On July 14, 2017, Adrenaline Mob was involved in a serious vehicular accident, which resulted in severe injuries for Allen and two deaths." So Russell Allen's statement about the hiatus was in May 2017, a few months before the band's accident in July. Then Russell spends some time recovering from the accident, at which point they announce (in January 2018) that they're going to get together and start writing the new album. This is obviously before Michael Romeo announces his solo album this month (May 2018). Notably, the solo album is a two-parter and supposedly has all sorts of songs and ideas he's been sitting on for awhile. I don't get the impression that this was an aborted Symphony X album that was only written in a couple of months, starting February of this year. Russell has always said Symphony X is his number one commitment, and I see no reason to doubt that. He's also definitely not bigger than the band, although I'm a big fan of all his side projects/guest appearances, and am glad they've had success. All in all, I don't see any grounds for the speculation that this solo album was an aborted Symphony X project. Michael Romeo's been interested in doing more solo work for years. Does no one remember how he enlisted the help of his fans to garner votes for a Hans Zimmer apprenticeship competition back in 2014? He's been dying to do orchestral work for ages, and not just stuff that would fit in the wheelhouse of Symphony X.