No, PDF-Print still writes simple PDF 1.3 or 1.4 - no X. Basically, PDF/X claims hat no difficult stuff should be used in a PDF, like transparencies, etc.
PDF-Print generated PDFs contain just
one image per page. If possible, let someone run a PDF tool over it to convert it to PDF/X standards.
Grüße / Greetings / Groetjes / Salutations,
Ulf Dunkel