{Citation needed.}
This seems unlikely given that "hikikomoru" is a compound verb which means to stay inside.
If it's nice weather but someone stays at home all day, the hikikomoru verb is used for that; it (still) doesn't have automatic connotations of it being a way of life.
The "komoru" part has various meanings (according to EDICT): "shut oneself in (e.g. one's room); to be confined in; to seclude oneself; to hide away; to stay inside (one's shell)" as well as "to be heavy with (e.g. smoke); to be stuffy; to be dense", plus others.