so much so that 是个固定搭配吗?

so much so that 是个固定搭配吗?
The old authoritarian methods of education were discredited rather a long time ago - so much so that many people now think that they have gone too far in the direction of trying to make children happy and interested rather than giving them actual instruction.
这里的so much so that 怎么讲

如此（长的时间）以至于（许多人...）
much后面省略了long time
that后面接从句

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