There's definitely a lot of speculation that goes into this, largely because Bettman does not believe in roster transparency/that fans aren't interested in this stuff, but...
Stupid question, but I think Jarventie is just precautions, not necessarily due to an injury. He would still be included?
Ottawa did not list Jarventie on their roster day, but they also did not list him as re-assigned, so he's probably non-roster for precautionary reasons and SOIRd to gain cap-relief
Could be missing a lot more as the SOIR designation is more difficult to find this season without cap friendly.
Puck Pedia calls it (injured non roster list) but the non roster list is players signed to contracts in the minors, confused listing per Puckpedia plus their site is most difficult to look at.
Several IR or LTIR designations might instead be SOIR that I’ve missed, CF where have you gone.
RD Regula + Boston
RD Mitchell + Boston
LD Joakim Ryan + Carolina
RD Levshunov + Chicago
C Brindley + Columbus
RW Dumais + Columbus
LW McCue + Columbus
LW Gettinger + Detroit
LD Buium + Detroit
RW Sourdif + Florida
RW Clarke + Minnesota
G Grosenick + Minnesota
LW Beckman + New Jersey
LW Filmon + New Jersey
C Highmore + Ottawa
LD Mukhamadullin + San Jose
LD Carlsson + San Jose
LW Chernyshov + San Jose
RW Robertsson + St. Louis
RD Adam Jiricek + St. Louis
C Minten + Toronto
LD Heinola + Winnipeg
Without going through the whole list, I believe most of those guys did not play NHL games last year so would not qualify for SOIR
Brandon Saad and Spencer Stastney are listed as Personal < Non-Roster not as SOIR.
Not sure of Stastney's situation either, but PuckPedia has him listed as both Non-Roster (Personal) and SOIR. If that personal is health related (ie. disability or mental heath not necessarily injury) maybe that could account?