Woah, less caps and racist thoughts and more critical thinking please. I am saying taking a simple average between the two like you did is flawed for a number of reasons.

1) You don't even have an apples to apples comparison. H1B data is based on prevailing wage which is just base pay. So taking your link, 129K - $171K/yr comparing to your other data, 100-150k. Lets take a simple average. and say the glassdoor wage is 150k, that means 50% minimum, remember you said minimum, is 75k. That does not really track with 125k.

2) Prevailing wage is based not only on the role but the geographical location too. An overall average between those two datasets is a very rough guide and I think its better to do direct comparisons at a company level or regional level. Again there is still a lot of normalization and cleanup to do in the datasets, the H1B data is not great for analysis right out of the gate.

Your case of a minimum 50% reduction in base pay is hard to defend except in outlier cases. If it was closer to 25% I think its a much easier number to defend.