Is what the committee did permissible, burying the old graveyard with two meters of soil and compacting it, and what is the ruling on entering the graveyard after this change?

What the scholars have agreed upon is that the deceased has a sanctity that prohibits the exhumation of their grave, or walking over it, or burying it with earth until it has completely decomposed. This is referred back to experts. Therefore, the obligation was to search for another place for burial, unless the cemetery is so old that decomposition of those within it is certain. If no other suitable place for burial is found, then it is permissible to do so, based on the principle that necessities permit the prohibited.