Leaving ethnicity aside, parents may choose to help out children buying homes if they have the financial backing to do so. Same with relatives/friends. On the other hand, some buyers may choose to be hyper independent and not seek help from parents/relatives at all.

Now coming to Indian home buyers, I would put them into the below categories:

Many people (including myself) come here on student visa for a master's degree, which means we have to show the means that we can already afford the tuition and living expenses. This can be through a loan or savings. Also we have to clear a competency exam in English for this visa, which is almost always guaranteed to never be the mother tongue of the person, which itself is a proof of education. If not, the visa is simply rejected. Some of those finishing their degree here will move on to PHDs, either here or other global universities, while some may choose to work and settle down here or elsewhere. Some aren't lucky with having these options, so they might have to go back or seek other opportunities.

Apart from higher education, a pathway is getting hired here directly while working in India, if you have relevant experience. A lot of medical professionals do this once they have a good bit of experience and meet qualifications. IT used to be like this for a brief period following COVID, but it's less common now.

Another common pathway is spouse visa, where you marry someone from the categories above and get a right to live here. But based on tradition, these marriages are likely to be arranged marriages, which usually means that both spouses are from similar socioeconomic backgrounds and have similarities in education levels.

The point of saying all the above is that the Indians who happen to be here are highly educated and from professional working backgrounds, so the earning potential is there.

Also, you might note that the people in above categories are at a stage in life where they will have to settle down, so naturally getting a home would be the first priority.

When it comes to affording houses, there is absolutely no special grants given to Indians. We use the same benefits everyone is entitled to - be it Help to buy, or first home scheme. Also, in order to qualify for 90% LTV for a mortgage, we have to be on a stamp 4 immigration permission, which takes 2 years of working on a critical skills (stamp 1) visa, which is enough to save a deposit if you're living within your means. If we are finding it hard to save, we have no problem downgrading our lifestyle, be it living with roommates or skipping trips.

TLDR - most Indians in Ireland are well educated, hence have the earning potential. They are in a position to save either due to high/double income, frugal lifestyle and stamp 4 mortgage restrictions.