I tried hiding the title using the first block of code and ended up hiding the entire WP editor.
This:
<style type="text/css">
#post-body-content {
display: none;
}
</style>
Should be replaced by:
<style type="text/css">
#titlediv {
display: none;
}
</style>
if the aim is hiding only the “title” field of the editor.
Glad I found this.