What is "Tay Bridge syndrome"? There are no Google hits. If you're going to use an obscure term (or make one up) then please define it.

Is it a reference to the Tay Bridge disaster? Looking at the Wikipedia article [1], it didn't seem to have anything to do with losing organisational knowledge due to retirement.

[1] https://en.wikipedia.org/wiki/Tay_Bridge_disaster

they hire low quality engineers from 3rd world countries for years to save money, at some point even hr department was from these countries and prefer only people from same country / nation, what quality you can expect from such products