I do not think that is correct. They are using Oracle Cloud. In fact, Mastek is betting huge on Oracle. Evosys is the leading player in Oracle Implementation globally. In addition Mastek bought another company in the US in 2017- TAISTech, it is also closely working with Oracle (Oracle ATG Product Implementation).
Based on the latest con call it looks like they are seeing huge demand for Oracle Cloud implementation and it is reflected in their PAT. Mastek never had PAT for more than 80 cr consistently in the last two decade. They reported 80+ once or twice but went to loss immediately in last decade. However this time due to Evosys acquisition, they are reporting 70 cr quarterly profit, which is huge jump.
I think things looking positive for Mastek.
Note- Holding share so views are biased.