Form input not being disabled
I copied your markup, setting and name and label manually and it added the disabled property if I used disabled: true

{{ forms.textField({
label: 'Example Label',
name: 'Example Name',
value : 'Example Value',
disabled: true,
required: true
}) }}




Perhaps you could try manually defining the field (as I did) without reading from the variables and confirm that it works.

If that fails, I suggest you enable dev mode and then use twig's dump() function to check that you don't have any errors and that the field is given correct values.

Is there anything in your log file?