No surprise - Su-30SM can carry up to 7 tonns of bombs. See e.g.
https://en.wikipedia.org/wiki/Sukhoi_Su-30 :
Aerial bombs: 6×
KAB 500KR, 3× KAB-1500KR, 8× FAB-500T, 28× OFAB-250-270, Nuclear bombs
IMHO, Su-24 and -34 crews need some rest, and since Su-30 can also do this job, why not?