I am sure about both 4.3 already tested and structural reinforcement planned at wings and lower surface.
Occasionally, it has been flight tested with even higher payloads.
Image 3. below shows a Tejas after a test flight with 4.05 tonnes (t) of payload. Notice that aircraft in Images 1,2 & 3 are Limited Series Production (LSP) test-units with 300 kg of flight instrumentation. In-service aircraft will obviously fly without such instrumentation and therefore can gain up to 0.3 t of extra payload capacity. Which means that their max payload capacity is roughly 4.35 t and not 3 t as has been claimed in the TOI article.
delhidefencereview.com
HAL Chairman R Madhavan in a media interview has confirmed Aircraft Research and Design Centre (ARDC) has completed the structural design of the new variant of Light Combat Aircraft. Tejas Mk1A will see a few improvements and strengthening on the Structural Design for better operations and maintainability. All these re-design/modifications to design, of not only the structure but also the electrical wiring, cooling system, etc. have been completed.
idrw.org