I feel "partial" in 'partial mobilization' intends to be deceptive. The version of the decree released to the public [1] contains nothing limiting number of recruits. That number is specified in a classified portion of the decree [2]. If it simply stated the same number Putin and Shoigu claim (300k), I doubt it would need to be classified.
Sounds like they're masking this as "partial" mobilization in the same way they've masked their war as a "special military operation."
[1] May need to open in reader: https://www.politico.eu/article/text-vladimir-putin-mobiliza...