This was even predicted by the famous Tamil cartoonist Bala after the TN state elections last year. In one of his tweets, he said, "DMK will take the sideline and show a soft corner towards BJP. The so-called DMK supportive progressive front liners will keep mum."
Also, journalist and political analyst Savukku Sankar has mentioned in his many interviews that the BJP's only claim to the DMK is to leave the Congress party alone without making an ally in the upcoming LS elections. Because the TN Congress is a party with no cadres but plenty of leaders. Until now, Congress' journey has been carried out by either of the Dravidian parties, DMK or ADMK.
Congress does not have the vote bank in TN to win at least a single MP seat. So, the DMK will be forced by the BJP to abandon the Congress and not form an alliance to end the Congress era in India. The ADMK party, already a known pet of the BJP, would not have the courage to add Congress as their ally against their big boss's wishes.
So, the 2024 LS elections are a survival battle for Congress and decide the fate of its future.