People just dont know what they are talking. I dont know from where they pull out fact about Tsunade chakra is as big as Bijuu chakra. Tsunade or Kishi never told about her chakra reserve size.
How they gauge/estimate Tsunade Chakra reserve? Shukaku TBB alone can destroy a mountain, I dont think Tsunade Full strength punch can destroy a hill let alone small mountain even though she used all her chakra reserve plus Byakugou chakra that she stored in 10 years.
And thats not full chakra TBB.
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Thats the power of individual TBB that create from chakra of each of the bijuus including Shukaku.
Thats tells you how large and powerful Bijuu chakra was. Tsuanade power cant compared with that same as Sakura.