Sorry, my dear Bhartiya Akhil, that I am afraid whether your above comments are correct with a conjunctive reading of the provisions of Chapters V-A and V-B of the IDA,1947 pertaining to Lay-off.
Since the poster's establishment is a factory having more than 100 employees on its rolls ( under an educated guess of not less than 100 on an average per working day for the preceding 12 months), it comes under Chapter V-B and as such the employer ought to have applied for prior permission to lay-off any number of their workmen u/s 25-M(1) from the appropriate Government.
The blatant failure on the part of the employer to do so renders the entire lay-off illegal and therefore entitles the workmen so laid-off to all the benefits under law including full wages as if they had been not laid-off as per the provisions of section 25-M(8).
Coming to your views about retrenchment in the wake of 45 days of lay-off, it is applicable only to industrial establishments falling under the purview of Chapter V-A alone. A conscious reading of the entire section 25-C of chapter V-A together with its two provisos would bring out that such acts of limiting the lay-off compensation to the first 45 days of lay-off and resorting to retrenchment afterwards are not automatic or discretionary but subject to the subsistence of an agreement to that effect between the workman and the employer.
Therefore, such relaxations in respect of lay-off compensation and retrenchment as well are not available to the poster's establishment as it clearly falls under chapter V-B of the IDA,1947.