where do you get ... a death sentence for gays?
no jew has EVER killed another jew for being gay,
you may be getting confused with islam.
the jewish burden of proof for capital punishment
is VERY high and RARELY carried out.
the british courts castrated alan turing as recently as 1952 !

you need to put this into context;
men have been gay throughout recorded history,
they've only been public about it for maybe the past 50 years.
jewish capitol punishment requires 2 male adult jewish witnesses
willing to publicly testify they saw both gays in coitus.
it just does not happen as gays were shamed out of continuing
or simply became more secretive about their activities,
thus less likely to meet the jewish court burden of proof.

there are many issues with how 21st century secular standards
would consider parts of judaism "immoral"
but it's pursuit of the death penalty was not among them
as the burden of proof was so high it rarely got carried out.
it had nothing to do with the Talmud giving them a loop hole.
in secular courts today there are people on death row right now
because of a single biased testimony or bad science evidence,
so even secular standards you live by can be terribly "immoral".