And it is you who has Einstein wrong on objective truth as something independent of what anyone thinks. For Einstein, objective truth is the concept of supposing that there is an “ideal limit of knowledge and that it is approached by the human mind. He may call this ideal limit the objective truth.” His “objective truth” is the limit of human thought, not the absence of the human contribution to concepts.
As a goal of inquiry such a notion of “objective truth” is even only tangentially relevent. That is why “He [the scientist] may have” it, and he may not. An increase in knowledge–scientific progress–is defined as creating a better “picture of reality” where progress in creating better pictures means making ones that are “simpler and simpler and will explain a wider and wider range of his sensuous impressions.” A scientist measures her progress in this way rather than as getting “closer to the truth.” “Closer to the truth” could only serve as means for measuring rogress if we knew what the truth was in advance of inquiry, and if we knew that we would not need to inquire to begin with. The practical goal of inquiry then is only ever to create new better beliefs and to assuage our doubts about existing beliefs rather than to successfully uncover some pre-existing Truth imagined as transcending human practice.
best,
Leela