The OneIndia report above is by Ananth Krishnan who has by now developed a reputation for not colouring his own reportage by his personal prejudices and hopes. I had put an unattributed quote from him only because I have faith in his reportage.
Brahmos-Mini is going to be 6 meter 1.5 tons, same as Nirbhay currently is. That is why they are saying that Nirbhay as it is can be mated to Su-30MKI. But to mate a Nirbhay to LCA the DRDO is reported to have claimed a need to shorten the Nirbhay by 25% ie. to a length of 4.5 meters. To swap a Tejas+Nirbhay variant for this Brahmos+Tejas variant, you will obviously have to reduce the Brahmos size to 4.5 meters too. But we already know Brahmos Mini is 6 meter.
The NLCA even in the Mk-2 version will have to use its excess capacity for extra internal fuel and not for heavier pylon load. So my suspicion is that they will persist with 1200 kg pylons or even if they re-design they will take it only till around 1500 kg. But that still does not solve the volume problem even for NLCA Mk-2.
However if you still insist in mating a high supersonic missile to later Tejas variants then you must look at changing Brahmos into a XASM-3 type missile (which will be a major major re-design effort):
https://en.wikipedia.org/wiki/XASM-3
Weight 900 kg (2,000 lb)[1]
Length 5.25 m (17.2 ft)[1]
Engine Integral Rocket Ramjet[1]
Operational range 150 km (81 nmi; 93 mi)
Speed Mach 3
Your 2 Brahmos Minis on one NLCA (presumably Mk-2) seems too much of an outlier to me. That will cut down the range of NLCA very badly and make NLCA shine on the radar like Bappi Lahari. You are asking for major trouble.
In any case LCA has only enough range to make itself felt at the borders. To hit beyond that you must rely on longer ranged Sukhois. Think about loiter times, ingress and egress speeds and altitudes, self protection capabilities, survivability etc.
An LCA with a stealthy Nirbhay variant is something we should look at seriously. Both to give LCA penetration capabilities and in general to screw the opponent from multiple directions. Something that Su-30MKI with Brahmos Mini will not be able to do, because the combo is going to be quite expensive for a real war.