I believe the article you linked to discusses the same study the OP acknowledges.
"These latest findings may initially seem to be at odds with a study published last Thursday in Science by researchers from Woods Hole Oceanographic Institution..."
"The Woods Hole team used an autonomous robot submarine and a mass spectrometer to detect the plume, but were forced to leave the area in late June...But that was before the well was capped in mid-July. Hazen said that within two weeks of the capping, the plume could not be detected"
"These latest findings may initially seem to be at odds with a study published last Thursday in Science by researchers from Woods Hole Oceanographic Institution..."
"The Woods Hole team used an autonomous robot submarine and a mass spectrometer to detect the plume, but were forced to leave the area in late June...But that was before the well was capped in mid-July. Hazen said that within two weeks of the capping, the plume could not be detected"