Learn Hardcore Hindi: यह डेबिट कार्ड नया है।

यह is the near demonstrative in Hindi, used for something close to the speaker.
Depending on context, यह can also mean he, she, or it, but here it clearly means this because it is pointing to डेबिट कार्ड.
In speech, यह is very often pronounced like yeh.

So:

Why is डेबिट कार्ड not translated into a more traditional Hindi word?

Because Hindi very commonly uses English loanwords, especially for modern objects, banking, technology, and business.

So डेबिट कार्ड is a normal and natural Hindi expression. Native speakers often say and write such borrowed words in Devanagari.

This is very common in Hindi:

So the sentence is perfectly natural Hindi, even though part of it comes from English.

Why is नया used instead of नई?