This noise calculation is not correct. The noise contribution of the second stage amplifier is divided by the second stage gain.
Please, see NF calculation formula in this document:
https://www.nxp.com/docs/en/white-paper/RFLNAWP.pdf
NFsys = 0.5dB + 3.5dB@G=30dB = 0.505dB
Have a great day,
Pavel
TIC
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