Presumably SLBMs from Ohio-Class submarines (SSBNs) are what you are referring to by "sea-launched nuclear deterrent." There is no change in either from Trump to Biden.
We are in fact building a whole new class of "boomer," the Columbia class, but the first one won't be out at sea until the 2030s. Approval and construction long predated Trump.
Neither our numbers of sea-based weapons nor doctrine changed at in any meaningful ways since the big cuts initiated by HW Bush.