If the Chelsea owners are very realistic with the clubs situation; then i would say that Pochettino burden at Chelsea is not heavy. Its a tough and doable task. Over 9 first team players are sold and replaced with very young talents which means its a rebuild under Pochettino
For me, i think it would be magic if Pochettino is able to get champions league football with that squad; they are all new, no chemistry, no depth; just too many new signings. Time will tell
I don't agree if you say Pochettino will not be burdened by Chelsea's demands. Pochettino has signed a contract to do his job of reclaiming the glory left for Chelsea in recent seasons. He has to take responsibility for the job he chooses to do, so obviously that will be the weight Pochettino is most likely to think about during his stay.
Chelsea supported him with a budget and smoothed out his development plans by selling several senior players. This team has been very different and there is no certainty whether Pochettino will succeed in a few seasons or maybe he will suffer the same fate as Tuchel, Graham Potter and Lampard.