The passage illustrates three methods for keeping Torreya from being decline. However, what the lecture talks about is totally against these three methods and shows us the reasons why these methods are not possible.
First of all, the lecture tells us that reestablishing Torreya in the same location is not a possible way to keep it from decline, because the weather in this area is strongly affected by the change of climate there which might be caused by the global warming on earth or by being drained of wetlands. So the climate there is becoming more and more dry which would impair the microclimate that Torreya is living. This statement in the lecture directly argues the reason told in passage that the Torreya could avoid decline by reestablishing.
Secondly, the lecture shows us basing on the example of one kind tree-black locust that the migration of this tree has killed many local plants living in that area. This case warns us the relocation of one new plant to new environment might contribute to a terrible ecological disaster. This example argues the possibility of relocation of Torreya talked about in the passage.
Finally, the lecture demonstrates that in order to resist diseases, the seeds bringing to the research center need to be large and genetic diversity. But the center lacks the capacity to make sure this diversity which is a key factor in this method that keeps Torreya living in a long term. This demonstration in the lecture argues for the method of preservation of seeds in research center in passage.