Earlier quoted context omitted.
That just looks like many older, low density suburbs (single family homes with some duplexes and ADUs sprinkled in) all across the US (especially older suburbs in the South). >It is dense It's absolutely not dense, probably less dense than newer suburbs with smaller lots. >walkable, and extremely beautiful. I'll give you that, it definitely looks beautiful.
I'd certainly call JP dense- it's got more than twice the population density of Houston, and it's slightly more dense than LA.
You're comparing a neighborhood of Boston to one of the largest cities in the US.
A more apt comparison would be the West University Place suburb of Houston that has roughly the same population density and similar size as JP. It's an older Houston suburb.
A "dense" suburban area would be something Jamaica in Queens, NYC. That has something like 6 times the density of JP.