If you have Docker installed you can use the kraigher/vhdl_ls container. You can set this option in the package settings.
If you have Rust installed you can install (
cargo install vhdl_ls) or build the crate from source (
git clone https://github.com/kraigher/rust_hdl && cd rust_hdl && cargo build -p vhdl_ls --release). Make sure to check the path in the package settings.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.