This is false:
“As a general rule, it is forbidden to exhume the remains of a deceased for reinterment in another place. This is true even if one's intention for doing so is in order to bestow honor to the deceased by the change of location. We are taught that the dead should never be disturbed because moving the remains of a deceased causes that person fear, confusion, and reminds them of their judgment day. In fact, it is forbidden to even open a coffin once it has been sealed and placed in the ground. If, however, at the time the original burial took place it was done with the understanding that the current location would only be temporary, then it is permitted to exhume and reinter at a later date.
There are a number of exceptions to this rule, however. One is permitted is exhume a body when the relocation is done in order for the deceased to be reinterred among his family members. Such a move, we are told, brings the deceased desired honor and pleasure. Related to this is the dispensation to move the remains of a person who, for whatever reason, was buried in a Gentile cemetery to a permanent resting place within a Jewish cemetery. So too, in the event that the cemetery where the dead are currently buried will be used disgracefully or there is a concern that Gentiles will irreverently move the bodies then the dead may be relocated some place else.
A well known application in connection with relocating the dead is doing so in order to bring a person to a permanent resting place in Eretz Yisrael. The reason burial in Eretz Yisrael overrides the prohibition of exhumation is because the earth of Eretz Yisrael has the power to atone for the sins of the deceased. In fact, some authorities suggest that it is permitted to exhume a body to bury it in Eretz Yisrael even if doing so is contrary to the explicit wishes of the deceased, though in such a situation the move must be initiated by the children of the deceased. Whenever a decision is made to exhume a body one must ensure that it does not appear that the disinterment is being done because others buried in the area are unworthy to lie with the one now being removed.
Now, since Israel did not exist at the time of the alleged Treblinka exterminations and cremations, reburial of remains in Israel could not have been "contrary to the wishes of the deceased."
If the Jews go to the trouble of giving bars of soap a Jewish burial and reciting the Kaddish for them, it is almost certain that there would be a massive push to get human remains exhumed and reburied in Israel- probably at Yad Vashem itself.
Does anyone seriously belief that the Jews and Israeli government would pass up such an opportunity?
The favorable publicity and the worldwide sympathy would be unprecedented. Heads of state from around the world would flock to Yad Vashem on the Day of Remembrance, where amidst the mournful sounds of the Shofar, the world would hear the thunderous "Never Again!" like never before.
And it would all be brought to us by Stephen Spielberg's "Eternal Aliyah Project"!