First statement is an absolute denial, how can you deny something without being absolutely sure about it?
Second statement is acknowledging the fact that we only know what we know or we don't know everything unless we come to know.
SPD has two types of missile strategies. FIXED BASE and MOBILE BASE
FIXED BASE is for large missiles that require assembly and erection at a fixed site. These missiles are currently stored under unmarked locations deep bunker silos in north of Pakistan.
MOBILE BASE are for medium sized and smaller missiles that are moved after every two or three months to different locations on launchers so that they cannot be attacked in case of an all out assault even by the USA.
However, there are some chinks in the armor. The largest chink being the use of BELL 412 helicopters provided by the US and used to ferry technicians and scientists to and fro from these mobile and fixed sites. These helicopters are marked by GPS location devices that can over a period of time draw a line and larger patterns to reveal the locations being visited repeatedly. These patterns of flights reveal over a period of time ALL possible locations fixed or mobile. Since mathematically speaking you can only have a set number of variations in your MOBILE BASE sites, its only a matter of time that the enemy is informed on how, when and how frequently our strategic pieces are moved and under what plans.