Perhaps, administration and governance aimed at national benefit sans any religious bias/prejudice/bigotry- pretty much the same as the actual definition of secularism but with the essential addition of stressing on the fact that the governance must still be aimed at achieving beneficial (for the nation as a whole) objectives. Perhaps necessitated by the dual fact that Congress treats secularism as favoritism for earning political cookie points and is willing to compromise certain national interests to do so. IF that is what he means then its kosher. Although I doubt he has the gumption to bring about a uniform civil code, nope.
Various governments have violated secularism left and right. I am not arguing that they haven't. The congress, by opening reservation blanketly to all muslims was violating secularism. There are many legitimate cases like that which enrage our sense of secularism. And why does it enrage us? Because we have an understanding of what secular means.
As for the last sentence, no - neither Modi nor anybody else will bring a uniform civil code, unless they get an overwhelming majority. And even then, it is doubtful - too much at stake.